That is, they have lots of different stocks in their portfolios, but these stocks all respond to the same economic factors. (tsinetwork.ca)
It does not matter if you buy stock in a single company or buy hundreds of different stocks in a mutual fund. (thefinancialjourneyman.com)
Building up a broadly diversified portfolio of many different stocks requires far too much capital for someone with a small investing budget. (investmentzen.com)