Buy the way just checked on cost of living increses from 1940 to present . What took a dollar to buy in 1940 according to inflation index takes 15.02 to buy in 2009.
so the $500 it cost you to wire that house in 1940 would be the same as $7510.00 in todays dollars. Look it up . Its really cheaper on average to wire a house today & its way better wired.