This mattress argument doesn't make sense because there are always companies offering cheaper mattresses.
For example in my country mattresses can cost over $1500 if bought from a traditional retailer.
So the brand Koala saw a gap in the market and decided to offer "mattresses in a box" for $600.
Now other boxed mattress brands are following suit.
BlackRock can't buy everything and not everything is being run by large corporations. Most business is small business.