To control for cyclical shifts, I'll look for a period where fast food employment decreases for five years in a row. If it starts declining in 2030 and continues to decline until eoy 2035, I will mark 2030 as the resolution date.

I am assuming at some point much, if not all, of the labor involved in serving fast food will get automated. If burger flipping hasn't lost relevance by 2060, this market will resolve N/A.