It depends on WHAT is being manufactured, FFS!
Generalizations are pointless. And dumb.
So Limbaugh pulled his “most of the cost is labor” out of his copious arse. I’d agree. He needs a staff to do research. He does misinform the public often.
I will grant you textiles/clothing are an outlier but post ANYTHING (durable goods) made today that is labor intensive meaning “most of the cost is labor”. Most being > 50% of cost. Post facts and not feelings.