It won't mean anything. The government statistics are not correct. Your 15.6 number is not even close to being correct. A new ford in 1931 was $345; today say $30,000. That is an increase of 78X.A new house was about $6800, today in Los Angeles anything decent is around $1,000,000! That is an increase of 148X. Of course not all things go up by a factor of 2 every 10 years, but they are closer to that then the government's ridiculous numbers!
In any case, all I was talking about is this particular set, a Lionel 407E, which sold for $350 in 1931! My figure of a value of $118,227 based on the rule of 2 every 10 years is deadly accurate for this set!! That is all I am concerned about here. In fact, I seriously doubt you could buy one for that price if a mint, complete example even exists!