President-elect Donald Trump vowed to impose massive new tariffs when he takes office on January 20, calling them “the biggest thing ever invented”. And unlike his other campaign promises, he has been consistent, repeatedly suggesting that he would impose a 10% to 20% tariff on all foreign goods and a 60% or higher tariff on goods coming from China.

The big question facing those who will be affected by Trump’s plans is how he will go about implementing the new tariffs — and how quickly. Here are some of its options, as well as potential roadblocks and consequences, and how countries, industries and companies might respond: