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Which is more economical 220volt or 110volt power supply?

Hey guys,
It's chilling cold here in this part of the country.What about your country?Today I am going to discuss why Some countries employ 220volt and some 110volt for household consumption.Actually the choice dates back to history when Thomas Edison and his company gave electricity at 110volt DC.Since it was employed first so people had mindset of having 110volt as safe.Although Nikola Tesla suggeted for 220volt AC but it was rejected by people.Now European countries required high voltages for big machines during world war 2,so they started giving 220volt and is continued till date.India also has 220volt power supply for household.Japan has110 volt.Now the question is which one is safer and which one is economical.Well as far as safety is concerned 110volt is much safer than 220volt but 110volt is costlier.Because for 110volt supply the wire required should have greater area of cross section so that resistance is less.Since resistance is inversely proportional to area of cross section so to get 110volt supply you have to invest more money on thick copper wires.Thus 220volt is more economical.
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