Answer:
security prices quickly reflect new information.
Step-by-step explanation:
In 1969, Eugene Fama proposed the informationally efficient capital market. It can be defined as a type of market in which all information relating to a stock portfolio of an organization would be incorporated into its current price.
Hence, in an informationally efficient capital market security prices quickly reflect new information.
This ultimately implies that, a capital market is said to be efficient when all the informations about securities (stocks) are fully reflected in its prices.