You need perpetual growth because all math models used in financial industry are based on perpetual exponential growth - imagine insurance companies, profitability, attractiveness of financial services, hedging etc. is based on the assumption the amount of wealth (money) increases in time. This is nowadays done basically with inflation only (the profits in trading are more-less inflation these days).<p>Now somebody said that the humanity&#x27;s greatest shortcoming is the inability to understand exponential function...