Shoe tarrifs favored the well-heeled?

[shoesense]

...or that's what I found out from NPR:

Oddly, the cheaper the shoes, the higher the tariff. A pair of $3 canvas sneakers has the single highest tariff in the United States: 67 percent. But $12 sneakers are assessed 37 percent, and for $300 Italian leather imports, there's no tariff at all. Why are tariffs higher on the shoes that poorer people buy?

Listen to the broadcast
here.