(a) A supply schedule is a table showing the various quantities of a commodity sellers are willing to sell at various prices, at a particular time.
(b) A market supply schedule shows the total quantities of a commodity which all the sellers of that commodity are willing to sell at various prices at a particular time. It is obtained by summing the individual supply schedules of all the sellers of the product. In the table below the individual supply schedule of Messrs P, Q and R are summed to obtain the market supply for the commodity.

PRICE PER UNIT ($)QUANTITY SUPPLIEDMARKET SUPPLY

MR.P	MR.Q	MR.R
10	20	15	30	65
20	30	25	40	95
30	40	35	50	125
40	50	45	60	155
50	60	55	70	185
60	70	65	80	215
70	80	75	90	245
80	90	85	100	275

(c) Exceptional demand:
(i) Fixed demand or perfectly inelastic demand e.g. salt.
(ii) Perfectly elastic demand.
(iii) Expectation of future increase in price.
(iv) Articles of ostentation: These are goods bought at higher prices because buyers believe such goods put them in high class in the society.
(v) Giffen goods: These are goods for which quantity demanded diminish when price falls.