Conservative, stop. You're falling behind here... Let's get you caught back up.
Closing the border isn't simply about exports (one component of GDP) but also Personal Consumption Expenditures. The panic wasn't over the fact that Ford could not ship cars across the border to Mexico. It was that it couldn't get components IN from Mexico in order to continue building cars for their domestic markets. The reality is while it would take 10 days to run out of all the avocados in America, all auto workers would be laid off in a week in the event of a full border crossing, two at most. This is due to "just in time" production - most assembly plants are only keeping a couple of shifts worth of production requirements in house at any given time. If even ONE of those parts isn't available, even if it's the smallest, cheapest bit of a bolt, the entire line stops, and the lay offs start.
And no, you can't just go to Costco and buy different bolts - every single component, from the most complicated computer to the most humble bolt, goes through an extensive approval process, taking weeks, and any deviation or change whatsoever starts the approval process all over again.
What Trump was doing on the border is wildly dangerous, irresponsible, and total proof that this guy doesn't have the first clue about how the world works. If you're a Catholic, now would be the time to start sending prayers to St. Francis (patron saint of drunkards and lost causes, for those wondering).