Demand curves for safety pins, designer watches, life-saving drugs, and cigarettes-

The demand curves for all the four goods (safety pins, designer watches, life-saving drugs, and cigarettes) will be inelastic in nature.

Demand is inelastic when the percentage change in quantity demand of a good is lesser than the percentage change in price of that good. All the four given goods are inelastic in nature due to the following reason -

1) Safety pins are low priced good and have a very little share in total consumer expenditure. Thus, any increase or decrease in price of safety pins does not cause much change in it's demand.

2) Designer Watches - the demand curve for designer watches would be moderately inelastic. The good is of luxury kind. They are demanded by upper middle income class people. The most of the consumers of the good make choices mostly on the basis of desire not by price. Thus, not much influence is seen on demand when price changes.

3) Life saving drugs - The demand curve will be perfectly inelastic. Life saving drugs will be required no matter what is the price. It is one of the most essential good. Its consumption is also not increased because of reduction in price. Thus, change in price does not change the quantity demand. Hence, it has perfectly inelastic curve.

4) Cigarettes - Cigarettes are used to quench habitual necessity. Smokers will urge to buy them even if price increases much. It has inelastic demand curve.