To realize digital cash you need a payment network with accounts, balances, and transaction. That‘s easy to understand. One major problem every payment network has to solve is to prevent the so-called double spending: to prevent that one entity spends the same amount twice. Usually, this is done by a central server who keeps record about the balances.
While cryptocurrencies are digital currencies that are managed through advanced encryption techniques, many governments have taken a cautious approach toward them, fearing their lack of central control and the effects they could have on financial security. Regulators in several countries have warned against cryptocurrency and some have taken concrete regulatory measures to dissuade users. Additionally, many banks do not offer services for cryptocurrencies and can refuse to offer services to virtual-currency companies. Gareth Murphy, a senior central banking officer has stated "widespread use [of cryptocurrency] would also make it more difficult for statistical agencies to gather data on economic activity, which are used by governments to steer the economy". He cautioned that virtual currencies pose a new challenge to central banks' control over the important functions of monetary and exchange rate policy. While traditional financial products have strong consumer protections in place, there is no intermediary with the power to limit consumer losses if bitcoins are lost or stolen. One of the features cryptocurrency lacks in comparison to credit cards, for example, is consumer protection against fraud, such as chargebacks.
This is a bank run in the sense that there is a mismatch in maturities, and thus a money fund is a "virtual bank": the assets of money funds, while short term, nonetheless typically have maturities of several months, while investors can request redemption at any time, without waiting for obligations to come due. Thus if there is a sudden demand for redemptions, the assets may be liquidated in a fire sale, depressing their sale price.
Money market funds offer high liquidity compared to other instruments with similar expected returns, like CD’s and treasury bills, while still being relatively low risk. You must typically hold a CD until its full maturity date to avoid paying an early withdrawal penalty. Treasury bills also have specific maturity dates. Money market funds, however, don’t have a set shelf life and can be liquidated on-demand when the cash is needed.
There are several different types of cryptocurrency wallets that cater for different needs. If your priority is privacy, you might want to opt for a paper or a hardware wallet. Those are the most secure ways of storing your crypto funds. There are also ‘cold’ (offline) wallets that are stored on your hard drive and online wallets, which can either be affiliated with exchanges or with independent platforms.
On the borrowing end, after 10–20 years, the S&P 500 corporations become extremely accustomed to obtaining funds via these money markets, which are very stable. Initially, perhaps they only borrowed in these markets for a highly seasonal cash needs, being a net borrower for only say 90 days per year. They would borrow here as they experienced their deepest cash needs over an operating cycle to temporarily finance short-term build ups in inventory and receivables. Or, they moved to this funding market from a former bank revolving line of credit, that was guaranteed to be available to them as they needed it, but had to be cleaned up to a zero balance for at least 60 days out of the year. In these situations the corporations had sufficient other equity and debt financing for all of their regular capital needs. They were however dependent on these sources to be available to them, as needed, on an immediate daily basis.