Public opinion is presumptively an input to policy formation in a democracy because politicians respond to it or at least are believed to respond [to it].
The case for trade is not just monetary, but moral. Economic freedom creates habits of liberty. And habits of liberty create expectations of democracy.
The purpose of democracy - supplanting old belief in the necessary absoluteness of establish'd dynastic rulership, temporal, ecclesiastical, and scholastic, as furnishing the only security against chaos, crime, and ignorance - is, through many transmigrations, and amid endless ridicules, arguments, and ostensible failures
Mexico has become a robust democracy with a robust press and an active legislature. It has gone from being a sending country for migrants to a transit country, and increasingly a receiving country for migrants in its own right.