Economic model in the context of Financial economics

Comparative advantage in an economic model is the advantage over others in producing a particular good. A good can be produced at a lower relative opportunity cost or autarky price, i.e. at a lower relative marginal cost prior to trade. Comparative advantage describes the economic reality of the gains from trade for individuals, firms, or nations, which arise from differences in their factor endowments or technological progress.

David Ricardo developed the classical theory of comparative advantage in 1817 to explain why countries engage in international trade even when one country's workers are more efficient at producing every single good than workers in other countries. He demonstrated that if two countries capable of producing two commodities engage in the free market (albeit with the assumption that the capital and labour do not move internationally), then each country will increase its overall consumption by exporting the good for which it has a comparative advantage while importing the other good, provided that there exist differences in labor productivity between both countries. Widely regarded as one of the most powerful yet counter-intuitive insights in economics, Ricardo's theory implies that comparative advantage rather than absolute advantage is responsible for much of international trade.

The circular flow of income or circular flow is a model of the economy in which the major exchanges are represented as flows of money, goods and services, etc. between economic agents. The flows of money and goods exchanged in a closed circuit correspond in value, but run in the opposite direction. The circular flow analysis is the basis of national accounts and hence of macroeconomics.

The idea of the circular flow was already present in the work of Richard Cantillon. François Quesnay developed and visualized this concept in the so-called Tableau économique. Important developments of Quesnay's tableau were Karl Marx's reproduction schemes in the second volume of Capital: Critique of Political Economy, and John Maynard Keynes' General Theory of Employment, Interest and Money. Richard Stone further developed the concept for the United Nations (UN) and the Organisation for Economic Co-operation and Development to the system, which is now used internationally.

In economics, an agent is an actor (more specifically, a decision maker) in a model of some aspect of the economy. Typically, every agent makes decisions by solving a well- or ill-defined optimization or choice problem.

For example, buyers (consumers) and sellers (producers) are two common types of agents in partial equilibrium models of a single market. Macroeconomic models, especially dynamic stochastic general equilibrium models that are explicitly based on microfoundations, often distinguish households, firms, and governments or central banks as the main types of agents in the economy. Each of these agents may play multiple roles in the economy; households, for example, might act as consumers, as workers, and as voters in the model. Some macroeconomic models distinguish even more types of agents, such as workers and shoppers or commercial banks.

An economic ideology is a set of views forming the basis of an ideology on how the economy should run. It differentiates itself from economic theory in being normative rather than just explanatory in its approach, whereas the aim of economic theories is to create accurate explanatory models to describe how an economy currently functions. However, the two are closely interrelated, as underlying economic ideology influences the methodology and theory employed in analysis. The diverse ideology and methodology of the 74 Nobel laureates in economics speaks to such interrelation.

A good way of discerning whether an ideology can be classified an economic ideology is to ask if it inherently takes a specific and detailed economic standpoint.

Keynesian economics (/ˈkeɪnziən/ KAYN-zee-ən; sometimes Keynesianism, named after British economist John Maynard Keynes) are the various macroeconomic theories and models of how aggregate demand (total spending in the economy) strongly influences economic output and inflation. In the Keynesian view, aggregate demand does not necessarily equal the productive capacity of the economy. It is influenced by a host of factors that sometimes behave erratically and impact production, employment, and inflation.

Keynesian economists generally argue that aggregate demand is volatile and unstable and that, consequently, a market economy often experiences inefficient macroeconomic outcomes, including recessions when demand is too low and inflation when demand is too high. Further, they argue that these economic fluctuations can be mitigated by economic policy responses coordinated between a government and their central bank. In particular, fiscal policy actions taken by the government and monetary policy actions taken by the central bank, can help stabilize economic output, inflation, and unemployment over the business cycle. Keynesian economists generally advocate a regulated market economy – predominantly private sector, but with an active role for government intervention during recessions and depressions.

The Belarusian economic miracle was a period of significant economic growth, urbanisation, and social change in Belarus during the late 20th and early 21st centuries. Beginning under Kirill Mazurov, the Belarusian economy began a process of industrialisation which greatly accelerated under Pyotr Masherov. It continued until the 2008 financial crisis, as Belarus endured the dissolution of the Soviet Union and subsequent economic problems within the region without wide-reaching privatisation. The economic model of Belarus during this time period has since been referred to the Belarusian model, and has since been attributed to the government of Alexander Lukashenko by Western analysts.

In microeconomics, supply and demand is an economic model of price determination in a market. It postulates that, holding all else equal, the unit price for a particular good or other traded item in a perfectly competitive market, will vary until it settles at the market-clearing price, where the quantity demanded equals the quantity supplied such that an economic equilibrium is achieved for price and quantity transacted. The concept of supply and demand forms the theoretical basis of modern economics.

In situations where a firm has market power, its decision on how much output to bring to market influences the market price, in violation of perfect competition. There, a more complicated model should be used; for example, an oligopoly or differentiated-product model. Likewise, where a buyer has market power, models such as monopsony will be more accurate.

Keynesian economics (/ˈkeɪnziən/ KAYN-zee-ən; sometimes Keynesianism, named after British economist John Maynard Keynes are the various macroeconomic theories and models of how aggregate demand (total spending in the economy) strongly influences economic output and inflation. In the Keynesian view, aggregate demand does not necessarily equal the productive capacity of the economy. It is influenced by a host of factors that sometimes behave erratically and impact production, employment, and inflation.

Keynesian economists generally argue that aggregate demand is volatile and unstable and that, consequently, a market economy often experiences inefficient macroeconomic outcomes, including recessions when demand is too low and inflation when demand is too high. Further, they argue that these economic fluctuations can be mitigated by economic policy responses coordinated between a government and their central bank. In particular, fiscal policy actions taken by the government and monetary policy actions taken by the central bank, can help stabilize economic output, inflation, and unemployment over the business cycle. Keynesian economists generally advocate a regulated market economy – predominantly private sector, but with an active role for government intervention during recessions and depressions.

In welfare economics, the theory of the second best concerns the situation when one or more optimality conditions cannot be satisfied. The economists Richard Lipsey and Kelvin Lancaster showed in 1956 that if one optimality condition in an economic model cannot be satisfied, it is possible that the next-best solution involves changing other variables away from the values that would otherwise be optimal. Politically, the theory implies that if it is infeasible to remove a particular market distortion, introducing one or more additional market distortions in an interdependent market may partially counteract the first, and lead to a more efficient outcome.

International political economy (IPE) is the study of how politics shapes the global economy and how the global economy shapes politics. A key focus in IPE is on the power of different actors such as nation states, international organizations and multinational corporations to shape the international economic system and the distributive consequences of international economic activity. It has been described as the study of "the political battle between the winners and losers of global economic exchange."

A central assumption of IPE theory is that international economic phenomena do not exist in any meaningful sense separate from the actors who regulate and control them. Alongside formal economic theories of international economics, trade, and finance, which are widely utilised within the discipline, IPE thus stresses the study of institutions, politics, and power relations in understanding the global economy.

Participatory economics, often abbreviated parecon, is an economic system based on participatory decision making as the primary economic mechanism for allocation in society. In the system, the say in decision-making is proportional to the impact on a person or group of people. Participatory economics is a form of a socialist decentralized planned economy involving the collective ownership of the means of production. It is a proposed alternative to contemporary capitalism and centralized planning. This economic model is primarily associated with political theorist Michael Albert and economist Robin Hahnel, who describes participatory economics as an anarchist economic vision.

The underlying values that parecon seeks to implement are: equity, solidarity, diversity, workers' self-management, efficiency (defined as accomplishing goals without wasting valued assets), and sustainability. The institutions of parecon include workers' and consumers' councils utilising self-managerial methods for decision-making, balanced job complexes, remuneration based on individual effort, and wide decentralized planning. In parecon, self-management constitutes a replacement for the mainstream conception of economic freedom, which Albert and Hahnel argue by its very vagueness has allowed it to be abused by capitalist ideologues.

Formal theory, also known as positive political theory, is the subfield of political science that uses formal methods such as social choice theory, game theory, and statistical analysis to deductively study political phenomena. It seeks to construct and use mathematical models to represent strategic choices in political contexts, such as in elections, legislative policymaking, and international politics. These models can either be tested empirically or used to elucidate real-world political phenomena by highlighting relevant incentives or causal mechanisms.

In political analyses using formal theory, social choice theoretic methods are often used to describe and axiomatically analyze the performance of rules or institutions. The outcomes of the rules or institutions described are then analyzed through game theoretic methods, where the individuals or parties or nations involved in a given interaction are modeled as rational agents playing a game, guided by self-interest. Based on this assumption, the outcome of the interactions can be predicted as an equilibrium or equilibria of the game. Many of the tools used in formal theory—such as game theory, bounded and instrumental rationality, utility functions, deductive logic, and modeling—were imported from neoclassical economics.