(Let’s push our bond-as-a-business example one notch further: if you elect to “retain” the annual earnings of a 12% bond by using the proceeds from coupons to buy more bonds, earnings of that bond “business” will grow at a rate comparable to that of most operating businesses that similarly reinvest all earnings. In the first instance, a 30-year, zero-coupon, 12% bond purchased today for $10 million will be worth $300 million in 2015. In the second, a $10 million business that regularly earns 12% on equity and retains all earnings to grow, will also end up with $300 million of capital in 2015.
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