Bloomberg A four-day rally that sent shares of the unprofitable vegetarian foodmaker Beyond Meat Inc. up more than 1,000%, only for a big chunk of the gains to vanish in a flash. A record-setting surge in gold prices, followed by the worst two-day selloff in years. Billions of dollars of inflows into risky ETFs that track volatile cryptocurrencies like Bitcoin and Solana. Everywhere you look these days, it’s hard to miss signs of individual retail traders cementing themselves as a dominant force in marke ...