pls explain and give some examples of perfectly elastic supply and perfectly inelastic supply?

Air is perfectly elastic. Everybody can have all they want and the trees will make plenty more. Time is perfectly inelastic. Everybody gets 24 hours a day, no more and no less.

Air is a perfectly inelastic demand. Everybody needs an exact amount, whether they gather it for free or they have to buy it in bottles. Time is a perfectly inelastic demand. Some people don't use all they get, others try to make more.

The smart baby guy is correct. Homogenous product will have perfectly elastic supply. Air is homogeneous if it is on sale.

The fruitful land has perfectly inelastic supply in the short run, said David Ricardo.It has economic rent.

I believe Dr Green should study the American health care system a little if he believes brain surgery has a perfectly inelastic demand.

Rubber trees & an element not yet invented !