After reading this article i crossed a question which kinda applies this concept in a GMATPREP Q.
Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to
ensure that the nuts are sold to domestic processing plants. If the tariff were lifted and
unprocessed cashews were sold at world market prices, more farmers could profit by
growing cashews. However, since all the processing plants are in urban areas, removing
the tariff would seriously hamper the government’s effort
...
Kernland imposes a high tariff on the export of unprocessed cashew nuts in order to
ensure that the nuts are sold to domestic processing plants. If the tariff were lifted and
unprocessed cashews were sold at world market prices, more farmers could profit by
growing cashews. However, since all the processing plants are in urban areas, removing
the tariff would seriously hamper the government’s effort
...