i. This may be possible if the number of new entrants into the labor force is increasing at a greater rate than the number of people who are becoming unemployed.
ii. Since the unemployment rate is a ratio and the numerator is growing more slowly than the denominator then the unemployment rate will fall.

(i) John Maynard Keynes was one of the most influential economists of the 20th century.
(ii) He was born in Cambridge in1883. In addition to his work as an economist he held position as civil servant a director of the Bank of England, and leader of British delegation of negotiators at the Bretton Woods conference at points in his career.
(iii)  Economic theory based on his idea is known as Keynesian economics, and remain highly influential today, particularly in the field of macroeconomics.

The following are the criticisms against Say's law:
(i) According to Keynes, supply does not create its demand. It is not applicable where demand does not increase as much as production increases.
(ii) Automatic adjustment process will not remove unemployment. Unemployment can be removed by increase in the rate of investment.
(iii) Money is not neutral. Individuals hold money for unforeseen contingencies while businessmen keep cash reserve for future activities.

(i) Effective demand denotes money actually spent by the people on products of industry.
(ii) The money which entrepreneurs receive is paid in the form of rent, wages, interest and profit.
(iii) Therefore effective demand equals national income.
(iv) An increase in the aggregate effective demand would increase the level of employment. A decline in total effective demand would lead to unemployment. Therefore,
(v) Thus the total employment of a country can be determined with the help of total demand of a country.