The Assignment Problem
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- Horst Siebert 3
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The assignment problem can be understood as the issue how decision rights are allocated to the agents and organizational subunits of a society. In this wide interpretation, the assignment problem refers to three different, albeit related phenomena: i) the allocation of property rights to individuals, i.e. households, and to firms, ii) the allocation of decisions rights to the government (including its subunits) relative to the private sector, and, within the sphere of government, iii) the attribution of policy instruments to economic policy agents. Economic policy agents are the different layers of government, the central bank, and trade unions to name the most important ones. 1 Assigning decisions rights is not only a national problem but refers to international decision rules as well.
We can think of the assignment problem as an optimizing problem in which decision rights are allocated in such a way that a goal function is maximized. In this fundamental issue of institutional economics, the goal function is complex, including values such as individual freedom and equity as well as the economic criterion of efficiency. Phrasing the assignment problem in these terms, I am putting the problem as if we were to reinvent mankind’s institutional arrangements from scratch. This is, of course, only an abstract and a rather theoretical approach. In the real world, the allocation of property rights to agents is given, and the given allocation changes only marginally except for major upheavals as in the shift from communist central planning to the market economy. In the following we look for some principles for the allocation of decision rights.
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Siebert, H. (2001). The Assignment Problem. In: Berninghaus, S.K., Braulke, M. (eds) Beiträge zur Mikro- und zur Makroökonomik. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56606-6_35
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Assignment problem
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Title: fair congested assignment problem.
Abstract: We propose a fair and efficient solution for assigning agents to m posts subject to congestion, when agents care about both their post and its congestion. Examples include assigning jobs to busy servers, students to crowded schools or crowded classes, commuters to congested routes, workers to crowded office spaces or to team projects etc... Congestion is anonymous (it only depends on the number n of agents in a given post). A canonical interpretation of ex ante fairness allows each agent to choose m post-specific caps on the congestion they tolerate: these requests are mutually feasible if and only if the sum of the caps is n. For ex post fairness we impose a competitive requirement close to envy freeness: taking the congestion profile as given each agent is assigned to one of her best posts. If a competitive assignment exists, it delivers unique congestion and welfare profiles and is also efficient and ex ante fair. In a fractional (randomised or time sharing) version of our model, a unique competitive congestion profile always exists. It is approximately implemented by a mixture of ex post deterministic assignments: with an approxination factor equal to the largest utility loss from one more unit of congestion, the latter deliver identical welfare profiles and are weakly efficient. Our approach to ex ante fairness generalises to the model where each agent's congestion is weighted. Now the caps on posts depend only upon own weight and total congestion, not on the number of other agents contributing to it. Remarkably in both models these caps are feasible if and only if they give to each agent the right to veto all but (1/m) of their feasible allocations.
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Assignment problems and their application in economics
Publication or External Link
Four assignment problems are introduced in this thesis, and they are approached
based on the context they are presented in. The underlying graphs of
the assignment problems in this thesis are in most cases bipartite graphs with two
sets of vertices corresponding to the agents and the resources. An edge might show
the interest of an agent in a resource or willingness of a manufacturer to produce
the corresponding product of a market, to name a few examples.
The rst problem studied in this thesis is a two-stage stochastic matching
problem in both online and oine versions. In this work, which is presented in
Chapter 2 of this thesis, a coordinator tries to benet by having access to the
statistics of the future price discounts which can be completely unpredictable for
individual customers. In our model, individual risk-averse customers want to book
hotel rooms for their future vacation; however, they are unwilling to leave booking to
the last minute which might result in huge savings for them since they have to take
the risk of all the hotel rooms being sold out. Instead of taking this risk, individual
customers make contracts with a coordinator who can spread the risk over many
such cases and also has more information on the probability distribution of the future
prices. In the rst stage, the coordinator agrees to serve some buyers, and then in
the second stage, once the nal prices have been revealed, he books rooms for them
just as he promised. An agreement between the coordinator and each buyer consists
of a set of acceptable hotels for the customer and a single price. Two models for
this problem are investigated. In the rst model, the details of the agreements are
proposed by the buyer, and we propose a bicriteria-style approximation algorithm
that gives a constant-factor approximation to the objective function by allowing a
bounded fraction of our hotel bookings to overlap. In the second model, the details
of the agreements are proposed by the coordinator, and we show the prices yielding
the optimal prot up to a small additive loss can be found by a polynomial time
In the third chapter of this thesis, two versions of the online matching problem
are analyzed with a similar technique. Online matching problems have been studied
by many researchers recently due to their direct application in online advertisement
systems such as Google Adwords. In the online bipartite matching problem, the
vertices of one side are known in advance; however, the vertices of the other side
arrive one by one, and reveal their adjacent vertices on the oine side only upon
arrival. Each vertex can only be matched to an unmatched vertex once it arrives and
we cannot match or rematch the online vertex in the future. In the online matching
problem with free disposal, we have the option to rematch an already matched oine
vertex only if we eliminate its previous online match from the graph. The goal is to
maximize the expected size of the matching. We propose a randomized algorithm
that achieves a ratio greater than 0:5 if the online nodes have bounded degree. The
other problem studied in the third chapter is the edge-weighted oblivious matching in
which the weights of all the edges in the underlying graph are known but existence
of each edge is only revealed upon probing that edge. The weighted version of
the problem has applications in pay-per-click online advertisements, in which the
revenue for a click on a particular ad is known, but it is unknown whether the user
will actually click on that ad. Using a similar technique, we develop an algorithm
with approximation factor greater than 0:5 for this problem too.
In Chapter 4, a generalized version of the Cournot Competition (a foundational
model in economics) is studied. In the traditional version, rms are competing in
a single market with one heterogeneous good, and their strategy is the quantity
of good they produce. The price of the good is an inverse function of the total
quantity produced in the market, and the cost of production for each rm in each
market increases with the quantity it produces. We study Cournot Competition on
a bipartite network of rms and markets. The edges in this network demonstrate
access of a rm to a market. The price of the good in each market is again an
inverse function of the quantity of the good produced by the rms, and the cost of
production for each rm is a function of its production in dierent markets. Our
goal is to give polynomial time algorithms to nd the quantity produced by rms
in each market at the equilibrium for generalized cost and price functions.
The nal chapter of this thesis is on analyzing a problem faced by online
marketplaces such as Amazon and ebay which deal with huge datasets registering
transaction of merchandises between many buyers and sellers. As the size of datasets
grow, it is important that the algorithms become more selective in the amount of
data they store. Our goal is to develop pricing algorithms for social welfare (or
revenue) maximization that are appropriate for use with the massive datasets in
these networks. We specially focus on the streaming setting, the common model
for big data analysis. Furthermore, we include hardness results (lower bounds)
on the minimum amount of memory needed to calculate the exact prices and also
present algorithms which are more space ecient than the given lower bounds but
approximate the optimum prices for the goods besides the revenue or the social
welfare of the mechanism.
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How to Solve the Assignment Problem: A Complete Guide
Table of Contents
Assignment problem is a special type of linear programming problem that deals with assigning a number of resources to an equal number of tasks in the most efficient way. The goal is to minimize the total cost of assignments while ensuring that each task is assigned to only one resource and each resource is assigned to only one task. In this blog, we will discuss the solution of the assignment problem using the Hungarian method, which is a popular algorithm for solving the problem.
Understanding the Assignment Problem
Before we dive into the solution, it is important to understand the problem itself. In the assignment problem, we have a matrix of costs, where each row represents a resource and each column represents a task. The objective is to assign each resource to a task in such a way that the total cost of assignments is minimized. However, there are certain constraints that need to be satisfied – each resource can be assigned to only one task and each task can be assigned to only one resource.
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Solving the Assignment Problem
There are various methods for solving the assignment problem, including the Hungarian method, the brute force method, and the auction algorithm. Here, we will focus on the steps involved in solving the assignment problem using the Hungarian method, which is the most commonly used and efficient method.
Step 1: Set up the cost matrix
The first step in solving the assignment problem is to set up the cost matrix, which represents the cost of assigning a task to an agent. The matrix should be square and have the same number of rows and columns as the number of tasks and agents, respectively.
Step 2: Subtract the smallest element from each row and column
To simplify the calculations, we need to reduce the size of the cost matrix by subtracting the smallest element from each row and column. This step is called matrix reduction.
Step 3: Cover all zeros with the minimum number of lines
The next step is to cover all zeros in the matrix with the minimum number of horizontal and vertical lines. This step is called matrix covering.
Step 4: Test for optimality and adjust the matrix
To test for optimality, we need to calculate the minimum number of lines required to cover all zeros in the matrix. If the number of lines equals the number of rows or columns, the solution is optimal. If not, we need to adjust the matrix and repeat steps 3 and 4 until we get an optimal solution.
Step 5: Assign the tasks to the agents
The final step is to assign the tasks to the agents based on the optimal solution obtained in step 4. This will give us the most cost-effective or profit-maximizing assignment.
Solution of the Assignment Problem using the Hungarian Method
The Hungarian method is an algorithm that uses a step-by-step approach to find the optimal assignment. The algorithm consists of the following steps:
- Subtract the smallest entry in each row from all the entries of the row.
- Subtract the smallest entry in each column from all the entries of the column.
- Draw the minimum number of lines to cover all zeros in the matrix. If the number of lines drawn is equal to the number of rows, we have an optimal solution. If not, go to step 4.
- Determine the smallest entry not covered by any line. Subtract it from all uncovered entries and add it to all entries covered by two lines. Go to step 3.
The above steps are repeated until an optimal solution is obtained. The optimal solution will have all zeros covered by the minimum number of lines. The assignments can be made by selecting the rows and columns with a single zero in the final matrix.
Applications of the Assignment Problem
The assignment problem has various applications in different fields, including computer science, economics, logistics, and management. In this section, we will provide some examples of how the assignment problem is used in real-life situations.
Applications in Computer Science
The assignment problem can be used in computer science to allocate resources to different tasks, such as allocating memory to processes or assigning threads to processors.
Applications in Economics
The assignment problem can be used in economics to allocate resources to different agents, such as allocating workers to jobs or assigning projects to contractors.
Applications in Logistics
The assignment problem can be used in logistics to allocate resources to different activities, such as allocating vehicles to routes or assigning warehouses to customers.
Applications in Management
The assignment problem can be used in management to allocate resources to different projects, such as allocating employees to tasks or assigning budgets to departments.
Let’s consider the following scenario: a manager needs to assign three employees to three different tasks. Each employee has different skills, and each task requires specific skills. The manager wants to minimize the total time it takes to complete all the tasks. The skills and the time required for each task are given in the table below:
The assignment problem is to determine which employee should be assigned to which task to minimize the total time required. To solve this problem, we can use the Hungarian method, which we discussed in the previous blog.
Using the Hungarian method, we first subtract the smallest entry in each row from all the entries of the row:
Next, we subtract the smallest entry in each column from all the entries of the column:
We draw the minimum number of lines to cover all the zeros in the matrix, which in this case is three:
Since the number of lines is equal to the number of rows, we have an optimal solution. The assignments can be made by selecting the rows and columns with a single zero in the final matrix. In this case, the optimal assignments are:
- Emp 1 to Task 3
- Emp 2 to Task 2
- Emp 3 to Task 1
This assignment results in a total time of 9 units.
I hope this example helps you better understand the assignment problem and how to solve it using the Hungarian method.
Solving the assignment problem may seem daunting, but with the right approach, it can be a straightforward process. By following the steps outlined in this guide, you can confidently tackle any assignment problem that comes your way.
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Operations Research
1 Operations Research-An Overview
- History of O.R.
- Approach, Techniques and Tools
- Phases and Processes of O.R. Study
- Typical Applications of O.R
- Limitations of Operations Research
- Models in Operations Research
- O.R. in real world
2 Linear Programming: Formulation and Graphical Method
- General formulation of Linear Programming Problem
- Optimisation Models
- Basics of Graphic Method
- Important steps to draw graph
- Multiple, Unbounded Solution and Infeasible Problems
- Solving Linear Programming Graphically Using Computer
- Application of Linear Programming in Business and Industry
3 Linear Programming-Simplex Method
- Principle of Simplex Method
- Computational aspect of Simplex Method
- Simplex Method with several Decision Variables
- Two Phase and M-method
- Multiple Solution, Unbounded Solution and Infeasible Problem
- Sensitivity Analysis
- Dual Linear Programming Problem
4 Transportation Problem
- Basic Feasible Solution of a Transportation Problem
- Modified Distribution Method
- Stepping Stone Method
- Unbalanced Transportation Problem
- Degenerate Transportation Problem
- Transhipment Problem
- Maximisation in a Transportation Problem
5 Assignment Problem
- Solution of the Assignment Problem
- Unbalanced Assignment Problem
- Problem with some Infeasible Assignments
- Maximisation in an Assignment Problem
- Crew Assignment Problem
6 Application of Excel Solver to Solve LPP
- Building Excel model for solving LP: An Illustrative Example
7 Goal Programming
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- The simplex method of goal programming
- Using Excel Solver to Solve Goal Programming Models
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8 Integer Programming
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- Binary Representation of General Integer Variables
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- Cutting Plane Method
- Branch and Bound Method
- Solver Solution
9 Dynamic Programming
- Dynamic Programming Methodology: An Example
- Definitions and Notations
- Dynamic Programming Applications
10 Non-Linear Programming
- Solution of a Non-linear Programming Problem
- Convex and Concave Functions
- Kuhn-Tucker Conditions for Constrained Optimisation
- Quadratic Programming
- Separable Programming
- NLP Models with Solver
11 Introduction to game theory and its Applications
- Important terms in Game Theory
- Saddle points
- Mixed strategies: Games without saddle points
- 2 x n games
- Exploiting an opponent’s mistakes
12 Monte Carlo Simulation
- Reasons for using simulation
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- Limitations of simulation
- Steps in the simulation process
- Some practical applications of simulation
- Two typical examples of hand-computed simulation
- Computer simulation
13 Queueing Models
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- The M/M/C System
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The assignment problem can be understood as the issue how decision rights are allocated to the agents and organizational subunits of a society. In this wide interpretation, the assignment problem refers to three different, albeit related phenomena: i) the allocation of property rights to individuals, i.e. households, and to firms, ii) the ...
THE PROBLEMS WITH COASIAN SOLUTIONS In practice, the Coase theorem is unlikely to solve many of the types of externalities that cause market failures. 1) The assignment problem: In cases where externalities a ect many agents (e.g. global warming), assigning property rights is di cult )Coasian solutions are likely to be more
Assignment problem. The assignment problem concerns the allocation of policy instruments to policy targets in order to improve policy effectiveness. Policy instruments are the variables or procedures that policy authorities directly control. Policymakers' use of these instruments to achieve objectives (i.e., policy targets) directly affects ...
In the assignment problem, we have that for an optimum allocation a 11 + a 22 >a 12 + a 21 i.e., a 11 a 12 >a 21 a 22: Neither absolute nor comparative advantage is the controlling principle. Basic principle is always opportunity cost in economics. Heckman Koopmans & Beckmann
The assignment problem is a fundamental combinatorial optimization problem. In its most general form, the problem is as follows: The problem instance has a number of agents and a number of tasks. Any agent can be assigned to perform any task, incurring some cost that may vary depending on the agent-task assignment.
a matching problem in that preferences are one-sided: objects do not have preferences over the agents.4 It generalizes the house allocation problem, which restricts attention to the case of unit demand.5 Yet, despite its similarity to problems that have been so widely studied, progress on combinatorial assignment has remained elusive. The lit-
Fair congested assignment problem. Anna Bogomolnaia, Herve Moulin. We propose a fair and efficient solution for assigning agents to m posts subject to congestion, when agents care about both their post and its congestion. Examples include assigning jobs to busy servers, students to crowded schools or crowded classes, commuters to congested ...
3. Econ 172A. Sobel. 10. The solution to the problem described by the second table is. exactly the same as the solution to the. rst problem. Continuing in this way I can subtract the \ xed cost" for the other. three people (rows) so that there is guaranteed to be at least one.
•In the assignment problem, we have that for an optimum allocation a 11 + a 22 >a 12 + a 21 i.e., a 11 −a 12 >a 21 −a 22. •Neither absolute nor comparative advantage is the controlling principle. •Basic principle is always opportunity cost in economics. Heckman Koopmans & Beckmann
Journal of International Economics 6 (1976) 337-346. Cp North-Holland Publishing Company THE BALANCE OF PAYMENTS AND O ECONOMIC POLICY The assignment problem revisited Lars NYBERG and Staffan VIOTTI .Institute for International Economic.Studies, Stockholm, Sweden Received December 19 75, revised version received May 1976 In this paper a policy model suggested by Niehans is extended to show the ...
2. THE LINEAR ASSIGNMENT PROBLEM. A relatively simple problem in the allocation of indivisible resources is that of matching two sets of an equal number n of objects, by making up pairs of ob- jects consisting of one object from each set. Objects belonging to the same set are similar in kind but not identical.
Four assignment problems are introduced in this thesis, and they are approached based on the context they are presented in. The underlying graphs of the assignment problems in this thesis are in most cases bipartite graphs with two sets of vertices corresponding to the agents and the resources. An edge might show the interest of an agent in a resource or willingness of a manufacturer to ...
Economics; As Taught In Fall 2012 Level Graduate. Topics Social Science. Economics. Macroeconomics; Learning Resource Types assignment Problem Sets ... assignment Problem Sets. Download Course. Over 2,500 courses & materials Freely sharing knowledge with learners and educators around the world.
2020. TLDR. This work defines an assignment to be feasible if it satisfies all quotas and assumes such an assignment always exists, and shows the mechanisms satisfy the same criteria as their classical counterparts: PS is ordinally efficient, envy-free and weakly strategy-proof; RP is strategy- proof, weakly envy- free but not ordinallyefficient.
The problem set is comprised of challenging questions that test your understanding of the material covered in the course. Make sure you have mastered the concepts and problem solving techniques from the following sessions before attempting the problem set: Introduction to Microeconomics. Applying Supply and Demand.
Step 1: Set up the cost matrix. The first step in solving the assignment problem is to set up the cost matrix, which represents the cost of assigning a task to an agent. The matrix should be square and have the same number of rows and columns as the number of tasks and agents, respectively.
Problem Set 5 ( PDF ) ( PDF ) Problem Set 6 ( PDF ) ( PDF ) MIT OpenCourseWare is a web based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.
CC licensed content, Original. Economic Thinking Problem Set. Provided by: Lumen Learning. License: CC BY: Attribution. 3.8: Assignment- Problem Set — Economic Thinking is shared under a license and was authored, remixed, and/or curated by LibreTexts.
This section contains the problem sets and solutions for the course. Browse Course Material Syllabus ... Economics; As Taught In Fall 2018 ... Social Science. Economics. Microeconomics; Learning Resource Types theaters Lecture Videos. assignment_turned_in Problem Sets with Solutions. grading Exams with Solutions. notes Lecture Notes. co_present ...
The rich world is in the midst of an unprecedented migration boom. Last year 3.3m more people moved to America than left, almost four times typical levels in the 2010s. Canada took in 1.9m ...
Problem Set 3 Data Sets: 1, 2, 3 (CSV) Problem Set 4 (PDF) Problem Set 4 Data Set (XLXS - 1.4 MB) Problem Set 5 (PDF) Problem Set 5 Data Set (CSV) This section contains the problem sets, their solutions, and accompanying code.
The highly caffeinated line of Charged drinks at Panera Bread was the subject of two wrongful-death lawsuits. By Amanda Holpuch Panera Bread will stop selling its highly caffeinated fruit-flavored ...
Due recitation 7. Problem set 4 (PDF) Problem set 4 solutions (PDF) Due lecture 20. Problem set 5 (PDF) Problem set 5 solutions (PDF) Due lecture 23. This section provides the problem sets assigned for the course along with solutions.
Students were asked to complete the following assignments for the course: Problem Sets. Replication Assignment: Write an essay that reviews, replicates, and extends an empirical paper in one of the topics covered in the course. Research Proposal: The goal of this research proposal is to give you a "jump start" on working on a topic that you ...