# All Questions

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17k views

### Why is the oil future price negative?

I don't understand why the price of oil futures went negative today. News say it is because sellers cannot sell it. But, why don't they just hoard it until the coronavirus crisis is off? Why don't ...
13k views

### Why do economists disagree so much?

I'm coming at this from a scientific point of view, having had no formal training in economics - most of what I know about it was from self-studying an undergraduate economics textbook. My question ...
79k views

### Partial vs. general equilibrium

Microeconomic models are usually classified as partial and general equilibrium models. As a layman, I understand that partial equilibrium focuses attention on a few economic variables to find the ...
4k views

### Topological concepts in economic theory

QUESTION: What are the major or systematic applications of post-1960s mathematics to microeconomics? For example, in the late 19th century, Fisher first used the mathematical ideas of Gibbs to ...
8k views

### How do economists explain why people contribute to Wikipedia?

What incentives do contributors have? I believe they earn no money. And usually, they earn no reputation either, because most of the contributions are anonymous. I believe this is a public goods game. ...
9k views

### How to intuitively understand the 'Intuitive criterion'?

The intuitive criterion by Cho and Kreps is a refinement to minimise the set of perfect Bayesian equilibria in signalling games. What would a simple and intuitive example to explain this criterion be? ...
5k views

### How do Marxist economists solve the Diamond-Water Paradox?

For class surveying different economic systems, I read a book on Marxism and its core beliefs. As I read, I came to learn that the Marxist view of economics depends heavily on the Labor Theory of ...
645 views

### When Optimal Control fails (?)

In order to "ask my question", I have to solve a model first. I will omit some steps but still, this will unavoidably make this post very long -so this is also a test to see whether this community ...
7k views

### Visualization tools for game theory: Game trees

There are many ways to draw a sequential game 'by hand'. By drawing the game I mean this: Displaying players' decision points, available actions and payoffs. Is there any way I can do this in R or a ...
324 views

### What have been the main developments in macroeconomics and financial economics since the 2008 financial crisis?

In the aftermath of 2008 economists were, fairly or not, blamed for a failure to foresee the coming crisis. Ideas such as "The Great Moderation" and market efficiency were openly ridiculed as ...
4k views

### Why is fractional reserve banking allowed?

I learned about banks' fractional reserves and that revolted me. How is that not considered to be fraud? The idea doesn't seem too sophisticated, on the contrary, it sounds very simple: the bank ...
12k views

### The relationship between the expenditure function and many others!

I dont understand the relationships between Hicksian demand, walrasian demand (marshallian), the expenditure function and the indirect utility function (including the value function V(b)). I have ...
5k views

### What was economics like as a field before Adam Smith, the father of *modern* economics?

Adam Smith is called the "father of modern economics" and his book The Weath of Nations, a fundamental work in the field of economics, is considered the first modern book on economics. In addition, ...
10k views

### If someone goes for a haircut, does it increase GDP?

If I go for a haircut, am I causing the GDP to rise because consumption is rising?
2k views

### How could the economic cost of the world not speaking the same language be estimated?

While languages are fun and add color and flair to cultures and make the world a more interesting place, they also have a cost. Beyond the monetary costs of translation/editing/proofreading, ...
976 views

### How do reserves move between the 12 federal reserve banks?

In single central banks systems (e.g. Bank of England) then the final ledger for electronic money transfer is the adjustment of reserve account balances. In the Federal Reserve System, there are 12 ...
2k views

### Use of mathematics and imprecise definition of terms

As a postgraduate student of economics I've been trying to expand my mathematical "toolset". While doing so I've talked to engineers, physicists and mathematicians, many of which have ...
426 views

### Uses of convex analysis in Economics

I'm taking kind of a crash-course in convex analysis to complement my mathematical skills and was wondering if anyone knew about nice ways in which this kind of tools were used in Economics. To be ...
4k views

### Larry Summers on the causes of secular stagnation

In an influential speech on November 8, 2013 at the IMF Annual Research Conference, Larry Summers suggested that slow economic growth in the years following the 2007–2008 financial crisis might be due ...
13k views

### Solow Model: Steady State v Balanced Growth Path

Okay, so I'm having real problems distinguishing between the Steady State concept and the balanced growth path in this model: $$Y = K^\beta (AL)^{1-\beta}$$ I have been asked to derive the steady ...
1k views

### Does risk aversion cause diminishing marginal utility, or vice versa?

Let $A$ be the set of possible states of the world, or possible preferences a person could have. Let $G(A)$ be the set of "gambles" or "lotteries", i.e. the set of probability distributions over $A$. ...
2k views

### The Sonnenschein-Mantel-Debreu results, what are the implications for macroeconomics?

I have always wondered why such a negative result such as Sonnenschein–Mantel–Debreu theorem (SMD) theorem is usually ignored or disregarded by practitioners, specially in macro. The result roughly ...
16k views

### Why do different countries have different currency?

Why do different countries have different currency? I have this question because I want to know why to divide it? If it's not divided then we can easily use the money anywhere and we won't need to ...
191 views

### Current knowledge about the empirics of consumer theory

I would like to get up to speed on the current state of empirical work done to test the assumptions and predictions of consumer theory (think Chapters 1, 2, 3, and 6 of Mas-Colell et al.). Can anyone ...
4k views

### Econometrics: Is elasticity meaningful in my, or any, regression?

A few months ago I interned at this organization; and, as a going away present, I decided to spend my last week, with whatever off time I had, to investigate the factors that affect teacher salaries. ...
1k views

### Solving the Hamilton-Jacobi-Bellman equation; necessary and sufficient for optimality?

Consider the following differential equation \begin{align} \dot x(t)=f(x(t),u(t)) \end{align} where $x$ is the state and $u$ the control variable. The solution is given by \begin{align} x(t)=x_0 + \...
460 views

### Stochastic growth in continuous time

Literature: See Chang (1988) for theoretical part and Achdou et al. (2015) for numerical part respectively. Model Consider the following stochastic optimal growth problem in per capita notation. \...
23k views

### How does a country devalue its currency?

I recently read an article in the New York Times that talked about China devaluing its currency (which I believe is held to a peg against the US Dollar). My question is: specifically what tools does a ...
240 views

### Can absence of inflation be accounted for by a reconfigured class structure?

A previous and oft-heard question asked why no inflation results from the Fed pumping money into the economy. Are we simply seeing a methodical wage suppression, thus no official "inflation," while ...
379 views

### Alternative way of deriving OLS coefficients

In another question of mine, an answerer used the following derivation of OLS coefficient: We have a model: $$Y = X_1 \beta + X_2 \beta_2 + Z \gamma + \varepsilon,$$ where $Z$ is unobserved. Then ...
11k views

### No Ponzi game condition and transversality condition are the same?

Given the following non-stochastic planning problem with finite horizon, \begin{align} &\max_{\{k_{t+1}\}}\sum^T_{t=0}\beta^tU[f(k_t-k_{t+1})] \\ \text{s.t. } & 0\leq k_{t+1}\leq f(k_t)\\ &...
17k views

### Why does quantity supplied increase with price in economics?

The Law of Supply is my worst enemy in economics because I could never truly understand it, and as a result, the stuff I learned after that was built on a weak foundation. The Law of Demand is totally ...
250 views

### Foundational equations or concepts of Finance

For the other sciences it´s easy to point to the most important equations, inequalities, propositions or concepts that ground the discipline. If I want to explain Finance to a physicist say, what are ...
398 views

### Is money mostly created (out of nothing) by banks making loans?

In the Bank of England's Quarterly Bulletin, 2014 Q1, McLeay, Radia, & Thomas write a pair of articles titled: "Money in the modern economy: an introduction" and "Money creation in ...
4k views

### What is the likely result of rent control in Berlin?

What predictions does economics make about the likely result of this policy in Berlin of capping rent prices. Berlin is freezing the rents of 1.5 million apartments for the next five years starting ...
2k views

### How is price elasticity determined in practice?

Price elasticity of demand and Price elasticity of supply are two of the most important concepts of microeconomics, but they're generally explained from a hypothetical standpoint, and little effort is ...
2k views

### Monopolies are just a mathematical misunderstanding

A little head-scratcher (and a good example why we should be careful with notation). Consider a profit maximizing monopoly, that solves over price $$\max \pi = PQ(P) - C(Q(P)) \tag{1}$$ Following ...
898 views

### Osborne, Nash equilibria and the correctness of beliefs

In Osborne's An Introduction to Game Theory Nash equilibrium is described as follows (p. 21–22): First, each player chooses her action according to the model of rational choice, given her beliefs ...