Ummm Lets Factor in the Cost of Living , New Materials (Must easier to install), All new appliances, Dishwashers, Microwaves, Hairdryers, Garage door openers, Ect Ect . Add GFI outlets (Cost about $5.00 bucks each (How many lives have they saved). Now lets see how good of a deal that 40s wired house is. I have 40s Electrical code I Know!!The house I live in was wired in the late 50s & I hat to rewire it to make it Safe!!! The 40s I think Not!!