This ETF offers exposure to the global equity market through the stocks of 100 of the largest companies in the world. But IOO is not truly global in nature; exposure is limited to developed markets, including the U.S., Japan, and Europe. As such, IOO can be a potentially useful tool for investors seeking one stop exposure to the developed global economy, including U.S. stocks and developed markets outside North America. Those considering this fund should take a close look at the exposure breakdown; many of the holdings are U.S. companies, and close to half the total portfolio is American companies. It should also be noted that IOO is almost exclusively large cap stocks; allocations to smaller firms is minimal in this fund. This fund is relatively balanced from a sector perspective, giving investors a sampling of every corner of the developed market economy. IOO is a fine ETF at an appealing price point, but there are alternatives that offer considerably greater depth of holdings, such as ACWI and VT.