Some points on a demand curve for a normal good are given here: Do you think that the increase in quantity demanded (from 90 to 110 in the table) when price decreases (from 21 to 19) is due to a rise...

Some points on a demand curve for a normal good are given

here:

Do you think that the increase in quantity demanded (from

90 to 110 in the table) when price decreases (from 21 to 19)

is due to a rise in consumers’ income? Explain clearly (and

briefly) why or why not.