The research indicates the evidence of purchasing power parity

 Per capita income, Purchasing power parity, List of countries by income equality

Purchasing power parity - Wikipedia

The Federal Reserve has been criticized for not forestalling the financial crisis of 2007–09, and for its unconventional monetary policies that have followed. Its critics have raised questions as to whom, if anyone, reins in the Federal Reserve if and when its policies are misguided or abusive. This paper traces the principal changes in governance of the Federal Reserve over its history. These changes have, for the most part, developed in the wake of economic upheavals, when Fed policy has been challenged. The aim is to identify relevant issues regarding governance and to establish a basis for change, if needed. It describes the governance mechanism established by the Federal Reserve Act in 1913, traces the passing of this mechanism in the 1920s and 1930s, and assays congressional efforts to expand oversight in the 1970s. It also considers the changes in Fed policies induced by the financial crisis of 2007–09 and the impact of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010. It concludes that the original internal governance mechanism, a system of checks and balances that aimed to protect all the important interest groups in the country, faded in the 1920s and was never adequately replaced. In light of the Federal Reserve’s continued growth in power and influence, this deficiency constitutes a threat not only to “stakeholders” but also to the independence of the Federal Reserve itself.

The law of one price is the basic unit of purchasing power parity (Rogoff, 1996)

The purchasing power parity hypothesis implies …

Wage: The payment for the service of a unit of labor, per unit time. In trade theory, it is the only payment to labor, usually unskilled labor. In empirical work, wage data may exclude other compensation, which must be added to get the total cost of employment.
Wage-rental ratio: The ratio of the wage of labor to the rental price of either capital or land, whichever is the other factor in a two-factor Heckscher-Ohlin model. The ratio plays a critical role in this model since it determines the ratios of factors employed in both industries.
Waiver: An authorized deviation from the terms of a previously negotiated and legally binding agreement. Many countries have sought and obtained waivers from particular obligations of the GATT and WTO.
Walras' Law: The property of a general equilibrium that if all but one of the markets are in equilibrium, then the remaining market is also in equilibrium, automatically. This follows from the budget constraints of the market participants, and it implies that any one market-clearing condition is redundant and can be ignored.
Walrasian adjustment: A market adjustment mechanism in which price rises when there is excess demand and falls when there is excess supply. Strictly speaking, these excess supplies and demands are those that would obtain without any history of disequilibrium, as with a Walrasian auctioneer.
Walrasian auctioneer: A hypothetical entity that facilitates market adjustment in disequilibrium by announcing prices and collecting information about supply and demand at those prices without any disequilibrium transactions actually taking place.
Warehouse receipt: A receipt issued by a warehouse listing the goods received.
Warehouse-to-warehouse: An insurance policy that covers goods over the entire journey from the seller's to the buyer's premises.
Warrant: An option issued by a company that allows the holder to purchase equity from the company at a predetermined price prior to an expiration date. Warrants are frequently attached to Eurobonds. A relatively long-term option to purchase common stock at a specified exercise price over a specified period of time.
Water in the tariff: The extent to which a tariff that is higher than necessary to be prohibitive.
Weak form efficient market:A market in which prices fully reflect the information in past prices.
Wealth: The total value of the accumulated assets owned by an individual, household, community, or country.
Weight note: Document issued by either the exporter or a third party declaring the weight of goods in a consignment
Weighted Average Cost of Capital (WACC): The required return on the funds supplied by investors. It is a weighted average of the costs of the individual component debt and equity funds. A discount rate that reflects the after-tax required returns on debt and equity capital.
Welfare criterion: A basis, usually quantitative, for judging whether one state of the world or of an economy is better than another, for use in welfare economics and in evaluation of policies.
Welfare economics: The branch of economic thought that deals with economic welfare, including especially various propositions relating competitive general equilibrium to the efficiency and desirability of an allocation.
Welfare proposition: In trade theory, this usually refers to any of several gains from trade theorems.
Welfare state: A set of government programs that attempts to provide economic security for the population by providing for people when they are unemployed, ill, or elderly.
Welfare triangle: In a partial equilibrium market diagram, a triangle representing the net welfare benefit or loss from a policy or other change. In trade theory it often means the triangle or triangles representing the deadweight loss due to a tariff.
Welfare: Refers to the economic well being of an individual, group, or economy. For individuals, it is conceptualized by a utility function. For groups, including countries and the world, it is a tricky philosophical concept, since individuals fare differently. In trade theory, an improvement in welfare is often inferred from an increase in real national income.
Wharfage charge: A charge assessed by a pier or dock owner for handling incoming or outgoing cargo.
White knight: A friendly acquirer who, at the invitation of a target company, purchases shares from the hostile bidder(s) or launches a friendly counter bid in order to frustrate the initial, unfriendly bidder(s).
Willingness to pay: The largest amount of money that an individual or group could pay, along with a change in policy, without being made worse off. It is therefore a monetary measure of the benefit to them of the policy change. If negative, it measures its cost.
Wire transfer: A generic term for electronic funds transfer using a two-way communications system, like Fedwire.
Withholding tax: A tax on income that is levied at the source, thus diverted to the government before the recipient of the income ever sees it. Used in international tax treaties to assist tax collection. A tax on dividend or interest income that is withheld for payment of taxes in a host country. Payment is typically withheld by the financial institution distributing the payment.
Working capital management: The administration of the firm's current assets and the financing needed to support current assets.
Working capital: An accounting term that indicates the difference between current assets and current liabilities. The combination of current assets and current liabilities.
World Bank: A group of five closely associated international institutions providing loans and other development assistance to developing countries. The five institutions are IBRD, IDA, IFC, MIGA, and ICSID. As of July 2000, the largest of these, IBRD, had 181 member countries. International Bank for Reconstruction and Development. An international organization created at Breton Woods in 1944 to help in the reconstruction and development of its member nations. Its goal is to improve the quality of life for people in the poorer regions of the world by promoting sustainable economic development. See also International Bank for Reconstruction and Development.
World Fact Book: An excellent source of information about the countries of the world, including basic economic data.
World price: The price of a good on the world market, meaning the price outside of any country's borders and therefore exclusive of any trade taxes or subsidies that might apply crossing a border into a country but inclusive of any that might apply crossing out of a country.
World Trade Organization (WTO): The WTO is a multilateral organization that promotes free and fair trade among the nations of the world. It was created in 1995 by 121 nations at the Uruguay Round of the General Agreement on Tariffs and Trade (GATT). The WTO is responsible for implementation and administration of the trade agreement. A global international organization that specifies and enforces rules for the conduct of international trade policies and serves as a forum for negotiations to reduce barriers to trade. Formed in 1995 as the successor to the GATT, it had 136 member countries as of April 2000.
Worldwide tax system: A tax system that taxes worldwide income as it is repatriated to the parent company. Used in Japan, the United Kingdom, and the United States.

Purchasing power parity was the centre point of the determination and changes in

The FASAB exposure drafts have not made a persuasive argument about basic matters of accounting, say the authors. Federal budget accounting should not follow the same procedures adopted by households or business firms because the government operates in the public interest, with the power to tax and issue money. There is no evidence, nor any economic theory, behind the proposition that government spending needs to match receipts. Social Security and Medicare spending need not be politically constrained by tax receipts—there cannot be any “underfunding.” What matters is the overall fiscal stance of the government, not the stance attributed to one part of the budget.

This conflict between market efficiency and long‐run PPP appears as something of a conundrum.