Some examples of possible candidates for AIM 'cash' https://www.portfoliovisualizer.com/backtest-asset-class-allocation?s=y&mode=1&timePeriod=4&startYear=1972&firstMonth=1&endYear=2021&lastMonth=12&calendarAligned=true&includeYTD=false&initialAmount=10000&annualOperation=0&annualAdjustment=0&inflationAdjusted=true&annualPercentage=0.0&frequency=4&rebalanceType=1&absoluteDeviation=5.0&relativeDeviation=25.0&portfolioNames=true&portfolioName1=Permanent+Portfolio&portfolioName2=33+each+Stock%2F10yrT%2FGold&portfolioName3=Total+Bond&asset1=TotalStockMarket&allocation1_1=25&allocation1_2=33.33&asset2=TreasuryNotes&allocation2_1=50&allocation2_2=33.34&asset3=Gold&allocation3_1=25&allocation3_2=33.33&asset4=TotalBond&allocation4_3=100 here .. ranging through 3% to 5% real rewards since 1987.