Reward and risk go hand in hand. The conventional wisdom of finance teaches that if one is to increase (or decrease), so must the other. Cost has a significant impact on both reward and risk. Lower costs make it possible to earn a higher return without assuming extra risk, or to hold reward constant and reduce risk. And because the passage of years multiplies the aggregate reward, moderates the volatility risk, and magnifies the burden of cost, time interacts with each of the three spatial dimensions of investing.
