According to Eric Balchunas, the resilience of the US stock market is largely attributed to three factors: widespread investor surrender to passive investment strategies, strong loyalty to low-cost US index funds, and investor perception of these funds as long-term holdings (source: Eric Balchunas on Twitter, June 17, 2025). For crypto traders, this entrenched behavior means that sudden capital outflows from equities into cryptocurrencies like BTC and ETH may be less likely, reinforcing the importance of monitoring macro trends and cross-market flows when planning crypto trades.