It’s α research project.
You take a set of states and apply a methodology that,

It’s α research project.
You take a set of states and apply a methodology that, from what it seems from other works, the formula is one.
You do some statistical tests and draw conclusions at the end.
from the papers I have read, the conclusion is common, that there is no strong evidence for a relationship between trade openness and abundance.
It is based on Romer’s theory that there is a negative relationship.
I don’t know what the extent of the coverage will be. There was no obligation to a minimum threshold.