keynesian economics has developed from the work of john maynard keynes and focused on macroeconomics in the short-run, particularly the rigidities caused when prices are fixed. it has two successors. post-keynesian economics is an alternative school—one of the successors to the keynesian tradition with a focus on macroeconomics. they concentrate on macroeconomic rigidities and adjustment processes, and research micro foundations for their models based on real-life practices rather than simple optimizing models. generally associated with cambridge, england and the work of joan robinson (see post-keynesian economics). new-keynesian economics is the other school associated with developments in the keynesian fashion. these researchers tend to share with other neoclassical economists the emphasis on models based on micro foundations and optimizing behavior, but focus more narrowly on standard keynesian themes such as price and wage rigidity. these are usually made to be endogenous features of these models, rather than simply assumed as in older style keynesian ones (see new-keynesian economics).