You want to talk discount mass, compare Sam Walton’s Walmart that prided itself in carrying American made goods. Multipacks and polybag programs existed then too. They were no cheaper after than before. Where cheaper did arise you’ll find lower quality goods. Those Polos you find at TJMaxx aren’t the same as the ones in Macy’s, they were made to spec to be sold at that price with a specific margin requirement at a specific retail preprice.
And it's not always the case that cheaper means lower quality. In the case of goods from Asia cheaper usually just means a lower cost of production.