Equities are generally considered the riskier asset class over both bonds and cash, but historical returns have been higher as well. A well diversified portfolio of all stocks can protect against individual company risk or even sector risk, but market risks will still exist that can affect the equities asset class. All-stock portfolios will perform best when the underlying economy is growing (as measured by GDP) and inflation is low to moderate, as inflation diminishes the future cash flows of equities.