Altcoins experienced a dramatic surge in 2020-21 as the government issued stimulus checks to support households during the coronavirus pandemic. Those unexpected freebies were largely channeled into the crypto market, which caused frenzied trading in the altcoin market. Bitcoin's dominance rate, or its share in the total crypto market cap, collapsed to 39% from 73% in six months to May 2021. "Retail-led rallies fueled by stimulus checks and [ultra high-net worth individual] cash, 80-90% retail flows allowed rapid cascades from majors to altcoins." It remains to be seen if the potential tariff dividend to the American people has a similar impact of broadening the crypto market bull run.