The primary purpose of a quota system is to: decrease paid by consumers, increase the price received by producers, generate tax revenue for the government, or all of the above?

if the government wanted to use a food tax in order to significantly reduce the quantity of sweet and sugary drinks we consume, this could be accomploshed with a relatively small food tax on these drinks if: demand was elastic, demand was inelastic, income elasticty was large, or income elasticity was small?