Answer:They can liquidate an estate.
Explanation: Annuities are contracts between a person and an insurance company following a future endeavors,the future endeavors can include lifetime income,future projects etc. Annuities are contracts which have been around for a long time now,they are similar to life insurance. Annuities can not liquidate estates,they are protected against outliving a person's income.
Annuities became very popular during the great depression in the United States of America,when the value of stocks dropped drastically.