I didn't realize it at the time, at least not consciously . . .

. . . but my Hill 'n Holler column pointed out how minimum wage laws hurt the poor.

Here's the relevant excerpt (emphasis mine; wait, it's all mine; you get what I mean.):

A proposed increase on admission to the city swimming pool from $2.00 per day to $3.00 per day in the upcoming season was unanimously approved. The increase comes to offset the increase the city will have to pay lifeguards due to the increase in the minimum wage. The price for passes will also increase, but the final amount has not yet been determined.

Who uses public swimming pools? The poor.

Who's going to have to pay a 50% increase to get into the pool or decrease their use of this public facility? The poor.