The issue with trade negotiations is that they are reciprocal negotiations. In order to gain something in a negotiation your country has to be willing to make a concession to the other country. To gain something you have to be willing to give something. On tariffs you have to agree to lower your tariffs in certain sectors in order to make gains in the other country’s market. Therefore, it is important that any time you are seeking to make an advantage you have to be willing to cede something in your own market.