Looking back at each of the past four decades, there was one sector that would have been the “home run” sector to be invested in. Other areas provided good returns to be sure, but these were the most profitable: 1970s: Gold, up 1,250%. The price of gold was fixed until 1971. Once it was left to float, it proceeded to run from around $50 an ounce to $681 just after the start of 1980 as inflation reared its ugly head. 1980s: Nikkei Index, up 1,000%. The decade of the Japanese market turned out to be largely a bubble, but...