lain the law of supply, and why the supply curve slopes upward? How is the market supply curve derived from the supply curves of individual producers?...

Explain the law of supply, and why the supply curve slopes upward? How is the market supply curve derived from the supply curves of individual producers?
Identify what are the major determinants of price elasticity of demand? Use those determinants and your own reasoning in judging whether demand for each of the following products is probably elastic or inelastic: (a) bottled water; (b) toothpaste; (c) Crest toothpaste; (d) ketchup; (e) diamond bracelets; and (f) Microsoft's Windows operating system.
Use the distinction between the characteristics of private and public goods to determine whether the following should be produced through the market system or by government: (a) French fries; (b) airport screening; (c) court systems; (d) mail delivery; and (e) medical care. State why you answered as you did in each case.