who is the theorist who developed general strain theory
Strain theory (sociology) In sociology and criminology, strain theory states that social structures within society may pressure citizens to commit crime. Following on the work of Émile Durkheim, strain theories have been advanced by Robert King Merton (1938), Albert K. Cohen (1955), Richard Cloward, Lloyd Ohlin (1960), Neil Smelser (1963), Robert Agnew (1992), Steven Messner and Richard Rosenfeld (1994).
Price elasticity of demand Together with the concept of an economic "elasticity" coefficient, Alfred Marshall is credited with defining PED ("elasticity of demand") in his book Principles of Economics, published in 1890.[20] He described it thus: "And we may say generally:â€” the elasticity (or responsiveness) of demand in a market is great or small according as the amount demanded increases much or little for a given fall in price, and diminishes much or little for a given rise in price".[21] He reasons this since "the only universal law as to a person's desire for a commodity is that it diminishes... but this diminution may be slow or rapid. If it is slow... a small fall in price will cause a comparatively large increase in his purchases. But if it is rapid, a small fall in price will cause only a very small increase in his purchases. In the former case... the elasticity of his wants, we may say, is great. In the latter case... the elasticity of his demand is small."[22] Mathematically, the Marshallian PED was based on a point-price definition, using differential calculus to calculate elasticities.[23]