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What prevents acid from backing up into the esophagus from the stomach?
National Debt
The total amount of money that a country's government has borrowed, by various means, from the private sector and other governments.
Interest Rates
The cost of borrowing money or the return for investing money, typically expressed as a percentage of the principal amount per year.
Primary Reserves
Liquid assets held by financial institutions as a primary means to meet immediate withdrawal demands or regulatory requirements.
Secondary Reserves
Liquid assets that can quickly be converted into cash but are not held as compulsory reserves by a financial institution.
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