This question was posed by MM DDS
Monday Morning Millionaire Program Answer:
With low fees and widely diversified exposure to major large-cap stocks, the SPY ETF is an excellent core portfolio choice and will grow at the same rate as the US economy over time.
If you manage an “explore” portfolio you will find a very large number of option contracts actively traded on the SPY ETF. This minimizes the bid-ask spread making the SPY ETF an excellent choice for an “explore” portfolio as well.