# Questions tagged [microeconomics]

Microeconomics is a branch of economics that studies the market behavior of individual actors (usually firms and consumers) and the aggregation of their actions in different institutional frameworks (usually the market).

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### Equivalent Variation of Price Change

If Bernice (whose utility function is min {x; y} where x is her consumption of earrings and y is money left for other stuff ) had an income of \$12 and was paying a price of \$3 for earrings when the ...
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### Why is the demand, supply and Engel curves plotted with the dependant variable in the X axis and the independent variable in the Y axis?

I am new to economics and have read the first 7 chapters in Intermediate microeconomics by Hal R Varian. Throughout the text, graphs are drawn with the dependent variable (Quantity) in X and ...
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(Skip to 3. for the actual problem I am facing. Everything else is just to help you understand it better up to that point) Two goods $X$ and $Y$ are substitutionals. For $P_X=20$ consumers ask for $Q_{... 0answers 7 views ### Is there a definition for ROAS that is not dimensionless? The most common definitions for ROAS are revenue/cost and (revenue - cost)/cost or ... 0answers 15 views ### Returns to Scale off a figure This is the table given for levels of output for different levels of inputs. \begin{pmatrix} Q & K & L\\ 100 & 3 & 6\\ 200 & 5 & 10\\ 300 & 7.5 & 15 \\ 400 & 10 &... 0answers 16 views ### Elasticity of substitution of a general production function with labor-augmenting technological progress I am following and trying to fully understand a famous and interesting work of Bentolila and Saint-paul (2003). They try to explain movements of the factor's share in terms of a relationship between ... 0answers 13 views ### Monotonic transformation of utility functions [duplicate] Why taking monotonic transformation of a utility function does not change marginal rate of substitution? 0answers 11 views ### Can we consider a supermarket as a market? Good morning, I have been reading a book in which the author said that "the supermarket is not a market, because despit the large number of buyers, the seller is unique". So, I've been wondering ... 0answers 18 views ### Grouping students by teacher in PISA microdata I'm looking to group the data on the individual students that participated in PISA 2018 according to their respective class or teacher. The data files are available for SPSS and SAS on this page, ... 0answers 36 views ### Given a demand curve determine the optimal total amount and price of$q_1$and$q_2$Given a demand curve for a monopolist $$P(Q) = 120 - 3Q$$ where$Q = q_1 + q_2$with two fabrics with the following marginal cost $$MC_1(q_1) = 10 + 20q_1 \\ MC_2(q_2) = 60 + 5q_2$$ I have to ... 0answers 8 views ### How does interest rates impact investment How does a decrease in interest rates decrease investment rates? This is how I believe a liquidity trap works, not sure if it is correct. Thank you 1answer 37 views ### Individuals vs. groups as decision makers In economics, why do people focus on the individual rather than groups of individuals as decision-makers? Wouldn't considering actions decided by a group of individuals reduce the chance of socially ... 0answers 23 views ### Taking the partial derivative of the demand function Define the demand function which maximizes x -> U(x) as:$\sum_{i=1}^n$$p_i$$\zeta_i$(p, I) = I According to my textbook if I differentiate this with respect to$p_j$I will obtain,$\zeta_j$(p, ... 1answer 78 views ### Math based proof for currency changes (microeconomics) This isn't part of my homework but I am genuinely interested in the mathematical proof behind this question (this is my line of work currently). I tried to work through it but after 2 hours gave up. ... 0answers 22 views ### If the payroll tax were eliminated on incomes below$30000 what would happen?

If you canceled all payroll taxes below $30000 /$60000 single / married what would happen? I know that this could increase firm profits, or increase wages, or the number of jobs, or decrease prices ...
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### 'Constrained optimisation' for mutually exclusive goods?

Taking the standard approach to constrained optimisation, where we maximise utility subject to a budget constraint with some allocation on the consumption of two goods, does it make apply the same ...
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### Production Possibility Frontier with 3 Goods

I want to make PPF Curve with 3 goods. Assumption : Economy that can produce three goods, Cloth $(C)$, Food $(F)$, Wine $(W)$. Two factors of production Capital $(K)$ and Labor $(L)$ So the ...
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### Reason for the increase in aggregate demand due to the existence of black money

How can existence of black money amd black assets due to corruption, tax evasion etc., increase the aggregate demand? Can anyone explain this with an example?
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### Does a depreciation in the Dollar lead to a reduction in the US' marginal propensity to import?

Does a depreciation in the Dollar lead to a reduction in the US' marginal propensity to import? I thought it would because a weaker dollar makes imports more expensive, so consumers spend less of ...
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### Upwards budget curve [duplicate]

I believe the curve is upwards sloping from (5 cookies, 0 veggies) until becoming a horizontal line at (10 cookies, 2.5 veggies) just double checking I've worked this out correctly. Please find the ...
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### Continuity of preferences

Let $\succsim$ be a transitive and reflexive relation on a metric space $X$ with closed upper and lower contour sets. If $\succsim$ is not complete, does it hold that: for all converging sequences ...
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### Relationship between strictly convex preference and convex preference

Let X be a convex subset of linear topological space and let binary relation >= be a complete preordering. prove: If preference relation is strictly convex and continuous, then it is convex. Since ...
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### Is optimizing revenue and expense objectives simultaneously better than optimizing profit as composite objective?

In the profit maximization problem, I am curious if co-optimizing revenue and expense objectives simultaneously are better than optimizing profit (revenue - expense) as a single composite objective? I ...
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### What if the government impose both price control and supply restriction on the market?

Due to the virus outbreak, there is a surge in demand for mask and hand sanitizes. To prevent price hiking government impose a price ceiling on the products, however consumers are behaving irrational (...
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### How to calculate the maximum willingness to pay? (Reservation price)

I have to solve the following exercise. I cant figure out what I have to do know. I hope i can get some help. Suppose you have the following utility: $U (x_1, x_2) = 4x_1 ^ .5+2x_2 ^ .5$ and you have ...
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### How to apply the direct method to elicit time preferences without utility?

The direct method (Attema et al, 2016) elicits time preferences (patience, impatience, discount factor) via a choice list procedure that does not require to know utility. Say you give a choice list ...
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### Optimising behaviour for labour supply

Suppose someone has an uncompensated labour supply schedule h(w,m)=A+Bw+Cm where h is hours of work, w is real wage rate and m is real unearned income. What are the requirements for optimising ...
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### Questions about merger simulation with logit demand

I'm trying to learn how to do merger simulation with logit demand. I think I get the concept of it and most of the math, but I'm struggling to put everything together and see how you would actually ...
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### Optimal tax level that raises revenue R < e given Hicksian demand elasticities

I have to find a uniform tax rate that raises revenue R < e and I am given a Hicksian cross price elasticity demand matrix below. I know I want to use Ramsey's first-best but I am not sure, how to ...
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### Derivation of a Demand Equation

A consumer's utility function is $U(x,y)=\sqrt x + y$. Assuming we have an interior solution, I need to show that the demand for $x$ does not depend on income. I know that the consumer consumes where ...
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### How to find the profit-maximizing output level?

Table 11 In this post, step 5 states the profit-maximizing output level is quantity 5. But in this case, $p=28$, $MC=30$, $p\neq MC$. Why it is the profit-maximizing output level? Step 4 states the ...
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### Microeconometrics course vs time series

I am currently a graduate student in Operations Research and I would like to learn econometrics, as it is not a part of the core curriculum. I am comfortable with matrix algebra (many courses used ...
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### Refinements in signaling games with three sender types

What are the pros and cons of the Intuitive Criterion and the Criterion of Divinity in signaling games with three types? I find that separating equilibria often survive the intuitive criterion, ...
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### Inforamtion asymmetry modeling

Is there any cook book, in finance, for models in information asymmetry, so as to make some practice?
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### How to prove monotonic transformation of the function and equivalence?

At the microeconomics course I have to prove monotonic transformation of the function U(x,y) = A(x^a)(y^b) into U(x,y) = (x^0.5)(y^0.5) Since the MRS are ay/bx and x/y resp. I can obviously only ...
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### Market mechanism design and decision rule based on a graph

I am doing a micro course right now. I came upon this question while studying and I was hoping for help/hints on how to solve it or what resources to consult to better understand the topic. the ...
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### Second welfare theorem problem

I would like to get a better understanding of part c of the following problem. It appears to me that Walrasian allocations do not change but I want to confirm whether I am right or not. Thanks. ...
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### weakly preferred consumer bundles

I am currently studying consumer choice and saw that weak preference refers to when an individual prefers or is indifferent to two bundles (such as bundle A and bundle B). I was wondering what is ...
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### Certainty equivalent and risk premium

I'd like some guidance on the below practice question on uncertainty in consumer theory. I think I am confused on the certainty equivalent & risk premium or I'm not understanding the question. ...
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### Who is the first one to equate “rational” with “complete and transitive”?

MWG taught that, suppose that the menu is finite, "rational" is the same as "complete and transitive". But it seems that it does not cite any sources. Who said this first? vNM said in 1944 that their ...
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### Is it correct to say opportunity cost is cost of giving up quantity of what you are selling?

In this video (https://m.youtube.com/watch?v=KEYYN-a_x6E), the instructor talks about the marginal opportunity cost and supply curve. (Begins talking about it at after 1:50). He states that the ...
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### Order of Marginal Effects in Ordered Regression Model

I'm looking to validate my understanding of marginal effects on the probability of an ordered probit model. I don't understand how ME is calculated in respect to some alternatives. For example if I ...
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### How do you calculate the cost of down time in production?

We are looking at a process that will significantly reduce down time in production for (at least) one of our products. In addition to the saved labor and material costs, is there a way to calculate ...
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### How to integrate technology lifetime in NPV

I want to calculate and compare the NPV for different ways of producing a good X. The NPV should be calculated for 30 years. The following technologies can be used for production: Technology A, which ...
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### Production for multiplant firm?

A multi-plant firm will never produce at a plant with an increasing marginal cost when they own another plant with a decreasing marginal cost. Is this true? My reasoning behind this is that firms ...