It is not a major issue in this fall’s presidential election, but it should be. In less than 10 years, by 2033, the Social Security system will go bankrupt — or, to be more precise, the balance in the trust fund the federal government uses to pay Social Security benefits will reach zero. What happens then? Well, actually, nobody really knows. But it has happened before. And by looking at what happened last time, we can learn about what could ha…