People love shopping at Costco however shopping at Welfare Mart is a challenge. The problem is fat shep gets into the 20 or less items isle with about 50 to 60 items. Support America by avoiding WELFARE MART.
Walmart markets products consumers need at prices that scream buy.
COST markets products consumers don't even know exist at prices that scream, look what I paid for this cool whats it.
Because Walmart and COST are not even in the same market, COST couldn't possibly blow Walmart away or vice versa.
In the same manner, ten even twenty retailer can be successful...that is profitable and growing, long term in the same market and same demographic area. It is not a win or lose situation. More than one winner is not only possible but is certain as the government has and must break up any monopolies that develops.