chessboard with growing heaps of rice grains, legend about the exponential function and the limits to growth, dark sky

about and bank banking board business capital cash chart chess chessboard collapse compound concept currency dark depth dividends economy excessive exponential field finance focus food function future game grain grains greed growing growth heaps immoderate increase interest investment legend limit limits many market mathematics metaphor money narrow plan profit resource retirement rice rising savings selected sky stock strategy success unlimited value wealth