Let's look at another portfolio using Portfolio Visualizer. In this case, let's have five as- sets: the U.S. Stock Market, the Global Ex-U.S. Stock Market, 10-year Treasuries, REITS (a way to invest in real estate) and gold. Historical data on REITs only begins in 1994, so make the start year 1994 and the end year 2021. Are any of the portfolios where you only hold one of the assets (and none of the other four assets) on the Efficient Frontier? Let's look at another portfolio using Portfolio Visualizer. In this case, let's have five as- sets: the U.S. Stock Market, the Global Ex-U.S. Stock Market, 10-year Treasuries, REITS (a way to invest in real estate) and gold. Historical data on REITs only begins in 1994, so make the start year 1994 and the end year 2021. Are any of the portfolios where you only hold one of the assets (and none of the other four assets) on the Efficient Frontier