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Most economy preparation goes straight to GDP, inflation and the budget, and skips the layer underneath — how a single price gets set at all. That layer is where the marks quietly sit. SSC and Railways ask it as definitions, UPSC asks it as an exception, and state PCS papers ask it as an example: which market is toothpaste, which good is a diamond.
The whole subject rests on two lines drawn on the same graph. The demand curve slopes downward because people buy more of something when it gets cheaper. The supply curve slopes upward because producers offer more when the price is better. Where the two cross, the market has found its price.
Everything else is a refinement of those two lines: which goods break the demand rule, how sharply quantity responds to price, and what happens when there is one seller instead of a thousand. Three ideas, and almost every question in this area is one of them wearing a different sentence.
1. A Giffen good is best described as:
2. The cross elasticity of demand between tea and coffee is:
3. Total utility from consuming a good is at its maximum when marginal utility is:
4. Under perfect competition, an individual firm is:
5. The price of a commodity rises by 10 per cent and the quantity demanded falls by 5 per cent. The demand for it is:
6. Consumers' incomes rise while the price of a normal good stays unchanged. This causes:
7. Toothpaste, soap and biscuits, sold by many firms under competing brands that differ only slightly, are examples of:
8. Governments tax petrol, liquor and cigarettes very heavily mainly because the demand for them is: