If the tax is collected from suppliers, and, if:
- The supply is perfectly elastic, then the suppliers will
decrease the quantity supplied easily at a decreased price and
hence the burden will fall on the consumers. This is because the
suppliers will reduce the supply significantly due to imposition of
tax.
- The supply is perfectly inelastic, then the suppliers will not
be able to decrease the quantity supplied at a decreased price and
then expressed the burden will fall on the suppliers.
- The demand is perfectly elastic, then a negligible increase in
price will cause the quantity demanded to fall drastically and thus
the incidence will fall on the suppliers. This is because the
consumers will reduce their consumption significantly due to
imposition if tax.
- The demand is perfectly inelastic, then no matter how much the
price increases, the consumers will not decrease their quantity
demanded and hence the burden of tax will fall on the
consumers.