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| == '''[[History of economic thought]]''' ==
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| ''by [[User:Nick Gardner|Nick Gardner]], [[User:João Prado Ribeiro Campos|João Prado Ribeiro Campos]] and [[User:Richard Jensen|Richard Jensen]]
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| | ==Footnotes== |
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| Modern economic thought is generally considered to have originated in the late eighteenth century with the work of [[David Hume]] and [[Adam Smith]], and the foundation of classical economics. (Earlier approaches are described in the article on the [[History of pre-classical economic thought]].) The nineteenth and twentieth centuries saw major developments in the methodology and scope of economic theory.
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| Nineteenth- and early twentieth-century economists applied deductive reasoning to axioms considered to be self-evident and to simplifying assumptions which were thought to capture the essential features of economic activity. That methodology yielded concepts such as [[elasticity]] and [[utility]], tools such as marginal analysis, and theorems such as the law of [[comparative advantage]]. An extension of the relationships governing transactions between consumers and producers was considered to provide all that was necessary to understand the behaviour of the national economy.
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| The development, in the later 20th century, of systems of [[economic statistics]] enabled economists to use inductive reasoning to test theoretical findings against observed economic behaviour and to develop new theories. By that time, the concept had emerged of the national economy as an open interactive system, and analysis of that concept provided explanations of [[recession|recessions]], [[unemployment]] and [[inflation]] that were not previously available. The application of empirical data and inductive reasoning enabled those theories to be refined and led to the development of forecasting models that could be used as tools of economic management.
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| The late 20th and early 21st centuries have seen further theoretical and empirical refinements and significant advances in the techniques of economic management.
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| ===Overview: categories of economic thought=== | |
| Historians categorise economic thought into “periods” and “schools” and tend to attribute each innovation to one individual. This categorization is helpful for the purpose of exposition, although the reality has been a story of interwoven intellectual threads in which advances attributed to particular individuals or schools have often prompted the work of others. For example, the quantity theory of money, which achieved prominence in the twentieth century and is associated with Milton Friedman, was first formulated at least three centuries earlier. Many of those threads that have permeated the categories referred to as "Classical economics" and "Neoclassical economics"—such as the concept of value and the nature of economic growth—had an earlier origin in "Pre-classical economics" (see [[History of pre-classical economic thought]]). "Classical" in economics denotes the adoption in the late eighteenth century of an approach that was inspired by the enlightenment and the methodology of the physical sciences, and had abandoned previous examinations of economics in terms of ethics, religion and politics. Preoccupation with those threads was overshadowed in the twentieth century by the responses of [[Keynesianism]] and [[monetarism]] to the problems of unemployment and [[inflation]], but the development of neoclassical economics started before that time and has continued thereafter. (The boundary between the "classical" and "neoclassical" categories is marked mainly by the rejuvenation of the value thread by the concept of [[utility]] and the associated explanation of price in terms of "[[supply and demand]]".) The introduction of new tools of exploration has since led to the vigorous development of that and other threads, and an expansion in the scope of economics into many new directions.
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| ''[[History of economic thought|.... (read more)]]''
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| ! style="text-align: center;" | [[History of economic thought#References|notes]]
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| {{reflist|2}} | | {{reflist|2}} |
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| | </small> |
Latest revision as of 10:19, 11 September 2020
The Irvin pin. The eyes have always been red, but there are
urban legends about the meanings of other colors.
A pin from another company, possibly Switlik or Standard Parachute. This style is common in catalogs and auctions of military memorabilia.
The Caterpillar Club is an informal association of people who have successfully used a parachute to bail out of a disabled aircraft. After authentication by the parachute maker, applicants receive a membership certificate and a distinctive lapel pin.
History
Before April 28, 1919 there was no way for a pilot to jump out of a plane and then to deploy a parachute. Parachutes were stored in a canister attached to the aircraft, and if the plane was spinning, the parachute could not deploy. Film industry stuntman Leslie Irvin developed a parachute that the pilot could deploy at will from a back pack using a ripcord. He joined the Army Air Corps parachute research team, and in April 1919 he successfully tested his design, though he broke his ankle during the test. Irvin was the first person to make a premeditated free fall jump from an airplane. He went on to form the Irving Airchute Company, which became a large supplier of parachutes. (A clerical error resulted in the addition of the "g" to Irvin and this was left in place until 1970, when the company was unified under the title Irvin Industries Incorporated.) The Irvin brand is now a part of Airborne Systems, a company with operations in Canada, the U.S. and the U.K.[1].
An early brochure [2] of the Irvin Parachute Company credits William O'Connor 24 August 1920 at McCook Field near Dayton, Ohio as the first person to be saved by an Irvin parachute, but this feat was unrecognised. On 20 October 1922 Lieutenant Harold R. Harris, chief of the McCook Field Flying Station, jumped from a disabled Loening W-2A monoplane fighter. Shortly after, two reporters from the Dayton Herald, realising that there would be more jumps in future, suggested that a club should be formed. 'Caterpillar Club' was suggested because the parachute canopy was made of silk, and because caterpillars have to climb out of their cocoons and fly away. Harris became the first member, and from that time forward any person who jumped from a disabled aircraft with a parachute became a member of the Caterpillar Club. Other famous members include General James Doolittle, Charles Lindbergh and (retired) astronaut John Glenn.
In 1922 Leslie Irvin agreed to give a gold pin to every person whose life was saved by one of his parachutes. By 1945 the number of members with the Irvin pins had grown to over 34,000. In addition to the Irvin Air Chute Company and its successors, other parachute manufacturers have also issued caterpillar pins for successful jumps. Irvin/Irving's successor, Airborne Systems Canada, still provides pins to people who made their jump long ago and are just now applying for membership. Another of these is Switlik Parachute Company, which though it no longer makes parachutes, still issues pins.
