Alfred Marshall (1842-1924) was one of the most influential economists of his generation. His book, Principles of Political Economy (1890) brought together the theories of supply and demand, marginal utility and the costs of production[?] into a coherent whole. It was the dominant textbook in England for a long period.
... 1520), discovered Brazil and Madagascar
Juan Sebastian del Cano[?] - completed the first circumnavigation, started by Magellan
Diego Cao, (died c. 1486), explored the ...