Offer your thoughts or opinion on the input financial query or topic using your financial background.

How can rebuilding a city/large area be considered an economic boost?
You are not wrong. This is called the "Broken Window" fallacy in economics. Imagine if 20% of a population was employed to go around breaking windows.  This would stimulate the economy as many people would have to be employed to make new windows, repair the broken windows, etc..  The problem is that everyone would have been better off if they didn't have to spend their valuable resources on repairing a perfectly functioning window. Although many people will be employed to rebuild Japan, this doesn't improve the standard of living for the folks in Japan.