Data sources: Stocks = S&P 500 Total Return (price + dividends). Bonds = US 10Y Treasury, approx. TR (const. duration d = 8). Money Market = US 3M T-Bill (FRED 1934+). Inflation = US CPI. CZK/USD = OECD via FRED (from 01-1991). Data: 1871–2026. Sources: Shiller (Yale), FRED (Fed. Reserve), Yahoo Finance. Disclaimer: Past performance is not a guarantee of future results.