['Buy High, Sell Low. Everyone knows that the way to profit in the stock market is to buy low and sell high. ... ', 'Buy on Margin, Face Margin Call. Margin is when an investor borrows money from their broker to make investments. ... ', 'Negative Real Interest Rates. ... ', 'Inflation. ... ', 'Currency Devaluation. ... ', 'Defaults. ... ', 'Commissions. ... ', 'Fees.']