is a savings account considered a demand deposit account
Demand deposit In the U.S., demand deposits only refer to funds held in checking accounts (or cheque offering accounts) other than NOW accounts; however, in a 1970s and 1980s response to the 1933 promulgation of Regulation Q in the U.S., demand deposits in some cases came to allow easier access to funds from other types of accounts (e.g. savings accounts and money market accounts). For the historical basis of the distinction between demand deposits and NOW accounts in the U.S., see Negotiable order of withdrawal account#History.
Dividend yield Its reciprocal is the Price/Dividend ratio.
Insurance Insurance is a means of protection from financial loss. It is a form of risk management, primarily used to hedge against the risk of a contingent or uncertain loss.
1 + 2 + 3 + 4 + ⋯ which increases without bound as n goes to infinity. Because the sequence of partial sums fails to converge to a finite limit, the series does not have a sum.