Walmart and Amazon alone sell $600bn worth of goods. That's 4% of US GDP. These two pushed thousands of independent retailers out of business due to lower prices (and smaller profit margins relative to revenue).

The same happens in transportation, restaurant business, hotel industry. Firms get bigger since 1800. Naturally, the number of new firms decline. In govt stats, it appears as "fewer startups."

Meanwhile, the economy grows thanks to productivity gains in big companies. So what do we want: productivity or new small businesses?