"Asset prices" refers to the value or cost of things that can be owned and have economic value, such as stocks, bonds, real estate, and commodities. It basically indicates the price or worth of these valuable items. Full definition
The capital asset pricing model made some predictions of return versus beta. (en.wikipedia.org)
Investors should therefore expect significant volatility in asset prices as valuations are adjusted to reflect the impaired ability of coal companies to maintain historical rates of return. (algore.com)
The capital asset pricing model is by no means a perfect theory. (investopedia.com)