After I read from a number of trusted sources and it turns out I get information, if the total number of bitcoins in circulation is 21,000,000. but if demand continues to increase, this number will be added again.
and the My question is very simple ...
Who will increase the amount of bitcoin, if then the demand increases ??
Did they Is make this bitcoin, actually ??
Well, your information source is wrong. Bitcoin has a total supply of 21m and the amount in circulation is not up to that yet. Bitcoin is not being increase when demand grows higher rather, it is being added to circulation through mining activities. No individual or even satoshi has the ability to increase bitcoin supply just because he feels the demand got increases