If you had invested $1000 in an index ETF every Friday (or last trading day of the week) at the closing price in 2016, how would you have done?

Excludes dividends and trading costs. 
Some brokerages wave the trading cost if investing in certain index ETFs, as long as the investment is held for a certain period of time.

• $SPY – SP500
• $VTI – Total market index
• $QQQ – Nasdaq 100
• $IWM – Russell 2000
• $EEM – Emerging Markets