Analyze the changes in qualities and prices of food using demand-supply analysis

The following table shows ie annual percentage change in volume {which can he understood as quantity} and price of the sales of goods sold in certain types of stores in Hong Kong based on the retail sales survey conducted by the Hong Kong Census and Statistics Department. Types of stores Percentage change Percentage change Percentage change Percentage change (sectors) in price 'oni the in volume front the in price from the in volume from the previous year previous year previous year previous year Food +53% 3.7% +53% 415%