The share of food expenditure in total expenditure for Urban consumer and Rural consumer in India was 56% and 64% respectively in (1987-88) and which changed to 41% and 54% in (2009-10). This is appropriately explained by which of the following ?
1
Decline in food production.
2
Decline in purchasing power of consumers.
3
Operation of Engel’s Law.
4
Operation of law of diminishing marginal utility.