Schools of economic thought

In the history of economic thought, a school of economic thought is a group of economic thinkers who share or shared a common perspective on the way economies work. While economists do not always fit into particular schools, particularly in modern times, classifying economists into schools of thought is common. Economic thought may be roughly divided into three phases: premodern (Greco-Roman, Indian, Persian, Islamic, and Imperial Chinese), early modern (mercantilist, physiocrats) and modern (beginning with Adam Smith and classical economics in the late 18th century). Systematic economic theory has been developed mainly since the beginning of what is termed the modern era. In the history of economic thought, a school of economic thought is a group of economic thinkers who share or shared a common perspective on the way economies work. While economists do not always fit into particular schools, particularly in modern times, classifying economists into schools of thought is common. Economic thought may be roughly divided into three phases: premodern (Greco-Roman, Indian, Persian, Islamic, and Imperial Chinese), early modern (mercantilist, physiocrats) and modern (beginning with Adam Smith and classical economics in the late 18th century). Systematic economic theory has been developed mainly since the beginning of what is termed the modern era. Currently, the great majority of economists follow an approach referred to as mainstream economics (sometimes called 'orthodox economics'). Within the mainstream in the United States, distinctions can be made between the Saltwater school (associated with Cornell, Berkeley, Harvard, MIT, Pennsylvania, Princeton, and Yale), and the more laissez-faire ideas of the Freshwater school (represented by the Chicago school of economics, Carnegie Mellon University, the University of Rochester and the University of Minnesota). Both of these schools of thought are associated with the neoclassical synthesis. Some influential approaches of the past, such as the historical school of economics and institutional economics, have become defunct or have declined in influence, and are now considered heterodox approaches. Other longstanding heterodox schools of economic thought include Austrian economics and Marxian economics. Some more recent developments in economic thought such as feminist economics and ecological economics adapt and critique mainstream approaches with an emphasis on particular issues rather than developing as independent schools. Islamic economics is the practice of economics in accordance with Islamic law. The origins can be traced back to the Caliphate, where an early market economy and some of the earliest forms of merchant capitalism took root between the 8th–12th centuries, which some refer to as 'Islamic capitalism'. Islamic economics seeks to enforce Islamic regulations not only on personal issues, but to implement broader economic goals and policies of an Islamic society, based on uplifting the deprived masses. It was founded on free and unhindered circulation of wealth so as to handsomely reach even the lowest echelons of society. One distinguishing feature is the tax on wealth (in the form of both Zakat and Jizya), and bans levying taxes on all kinds of trade and transactions (Income/Sales/Excise/Import/Export duties etc.).Another distinguishing feature is prohibition of interest in the form of excess charged while trading in money. Its pronouncement onuse of paper currency also stands out. Though promissory notes are recognized, they must be fully backed by reserves. Fractional-reserve banking is disallowed as a form of breach of trust. It saw innovations such as trading companies, big businesses, contracts, bills of exchange, long-distance international trade, the first forms of partnership (mufawada) such as limited partnerships (mudaraba), and the earliest forms of credit, debt, profit, loss, capital (al-mal), capital accumulation (nama al-mal), circulating capital, capital expenditure, revenue, cheques, promissory notes, trusts (see Waqf), startup companies, savings accounts, transactional accounts, pawning, loaning, exchange rates, bankers, money changers, ledgers, deposits, assignments, the double-entry bookkeeping system, lawsuits, and agency institution.