Answer: increase
Step-by-step explanation:
A tariff is a tax that is levied on goods that are imported into a particular country. It should be noted that tariffs are levied on order to prevent dumping, protect the host indutries and also prevent consumption of harmful products.
If the USA introduces a tariff in the market for gigastraps, the price of gigastraps in the USA will increase. This is because the tariff will be added as production cost to the producer which will lead to increase in price.