Several outlets are suggesting exchange-traded funds (etfs) that can be purchased with a relatively small amount of money, such as $100, and held long-term. The specific etfs recommended vary, with some outlets suggesting vanguard or s&p 500 etfs, and others recommending growth etfs. The number of etfs recommended also differs, ranging from 2 to 4, and the investment timeframe suggested is often indefinite, such as "forever" or "for a lifetime".