Explain the relationship between
(i) Prices of other goods and demand for the given good.
(ii) Income of the buyers and demand for a good

Solution :(i) Price of other goods and demand for the given good : Demand for a commodity may be affected by the prices of other goods. The other goods may be substitute goods and COMPLEMENTARY goods.
Price of substitute goods: Those goods which can be used at the place of another are KNOWN as substitute goods like tea and coffee. If the price of tea increases then the demand of coffee will increases because then the demand of coffee will increases because now it is cheaper in comparison to tea on the other side, if the price of tea FALLS, the demand of tea will increases, because now it is cheaper than coffee.
Price of complementary goods: Those goods which we cannot use without one another are known as complementary goods. Such as car and petrol if the price of car rises then the demand for petrol falls down. The reverse will happen when the price of car falls.
(ii) Income of the buyers and demand for a goods. Income of the buyers affect the demand of goods. Generally, we can SEE when the income of buyer increases the demand increases and vice versa. The effect of increase in income is not uniform on the demand of all goods. When income increases, the demand of NORMAL goods increases and that for inferior goods decreases. The reverse of it happens when income falls