The SPDR S&P 500 ETF Trust (SPY) is a broad measure of the U.S. stock market and tends to react positively to favorable economic forecasts. The White House's projections, if realized, could lead to increased consumer spending and business investments, driving up corporate earnings and, consequently, stock prices. The emphasis on 'pro-growth' policies, including child-care and other initiatives to boost labor force participation, suggests a supportive environment for economic expansion, which is generally positive for equity markets.