In a command economy, supply and demand are replaced by government edicts. However, the national economy can still fail, as happened in the USSR.
simply its identify by increase the demand with low price and vice versa. its like a rule in economic feild that descripe the relation between price and demand . its a law because you cant do the opposite ..like highe price and quantity .
Income, Substitutes, complementary goods, tastes and preferences are some of the non-price determinants of demand.
you cant.
you usually cant buy things you want
It cant be replaced!
I cant tell the future
Cant you have to replace the entire radio
Because discretionary Income = The money people have left over once they have paid for all of their basic requirements (Food, Clothing, Shelter). You could also call it Disposable Income because it is money you have (hopefully) that you can spend on whatever you want. If people do not have very much discretionary income then they cant buy all kinds of useless stuff that marketers are trying to sell them. This would limit the potential demand for a good or service.
it depends if you can suck air into your throat and stomach then let it out some folks have that special talent but if not then no you cant burp on demand
that you cant replace or refill the item
replace it. cant be fixed.
No you cant