It's shrinking by your definition, growing by others (the poor of today are the middle class of history if you look at poverty levels, purchasing power, or class mobility).

Further, we are in a noticeable amount of ways not a free market. If I took my car engine (the free market) to a mechanic and said "It's not working after I just made a couple of random small changes to it", the mechanic would rightfully laugh me out the door because me just meddling with a complex system, even if its only a small amount, can have disastrous side effects.