Answer:
The imposition of a sales tax would reduce both the supply and the demand for the shoes, and would also reduce overall eocnomic benefit in the form of reductions of consumer surplus and producer surplus.
This is because the sales tax will make the cost of shoes more expensive for the producers. The producers in turn will either produce less shoes, or raise the prices or the shoes.
The higher prices will be met by consumers with a declining demand, and producers in turn will respond, with time, by producing less shoes.