<span>Seleccionar un problema de investigación. Formulación de hipótesis. Variables de interés. Seleccionar niveles de una variable independiente. Seleccionar una variable dependiente .... dos o más teorías. El interés del investigador puede no tener nada que ver con la solución de un problema psicológico o sociológico existente. Como se discutió en el anterior</span>
The answer is "John Maynard Keynes's theory".
Keynesian financial aspects created amid and after the Great Depression, from the thoughts displayed by John Maynard Keynes in his 1936 book, The General Theory of Employment, Interest and Money. Keynesian business analysts for the most part contend that, as total request is unpredictable and shaky, a market economy will regularly encounter wasteful macroeconomic results as monetary retreats and and inflation.
A and B because the quote explains that large groups of people got together to form associations so A and B both make sense for the question
