I'll take an even firmer stance than @ElectricToothpick: Don't
To put this another way, what's the cost-benefit analysis? The cost is that you could make a reputation for yourself as someone who looks to gain too much of the credit. This is a reputation that will hinder your ability to get on future papers. The benefit is that you get more credit for this paper.
In the papers that I have read, there is the tendency to assume that the order of authors is in decreasing contributions. I have seen one author contribution section; it was in a paper where the two authors wanted to make it clear that they were equal contributors. In that case, the response of the the folks with whom I was talking about was along the lines of "Oh, that's nice." Had the contribution section been more along the lines of "The first author contributed 90% of the data", it would have been very jarring to us. The only time that this sort of a thing wouldn't look bad would be if an advisor wants to make sure a student gets credit. But there are other ways to do this.
You can get more credit as the primary author in other ways. Principally, if you are the face that champions this paper; e.g. in conference presentations or future papers, the ideas from this paper will become tied to you without needing to intentionally draw attention to yourself.
Now, granted, my papers have been in a different realm than yours, so maybe there's a practice of this in Econ. I think the easiest way to answer this question is to ask you how many of the papers you have read include a section like this? If you can't point to a sizeable percent of papers that include contribution sections to denote primary contribution, the inclusion of the section is liable to draw more negative attention than positive.