"Cash is king" is a colloquial phrase sometimes used in analyzing businesses or investment portfolios. It may refer to the importance of cash flow in the overall fiscal health of a business. In corporate finance, the expression refers to the fact that only future free cash flows or dividends are relevant for valuation and not, for example, accounting earnings. For managers and investors, it may also describe the advantage of having a large percentage of cash or short-term debt instruments available either due to falling financial markets or due to the availability of investment opportunities. The phrase has also come to be associated with businesses that only accept cash, rather than card payments.
The concept of "cash is king" describes the importance of sufficient cash as an asset in the business for short term operations, purchases and acquisitions. A company could have a large amount of accounts receivables on its balance sheet which would also increase equity, but the company could still be short on cash with which it can make purchases, including paying wages to workers for labor. Unless it was able to convert its accounts receivable and other current assets to cash quickly, it could fail and be technically bankrupt despite a positive net worth.