I have a couple of issues with your response. The first is the deficit is the amount of the government overspend over a set period of time for example a year. The ongoing amount the government has already borrowed and issued in bonds is the government debt. The deficit or government debt depending on how you define it (I will describe it as the quantity of government bonds issued) is not just government spending it is a agreement to pay back the principal amount borrowed at the maturity date with coupon payments every six months. This means the government debt is not just a deficit it is a future liability or agreement to make repayments. My second point is your use of taxation as a method of backing up currency and the need to issue a (your terminology) deficit to create money in the first place. If this was the case the currencies of countries that have surpluses of cash and no government bonds would not be able to issue currency.
There is a error in your accounting. Although issuing sovereign bonds gives the appearance of borrowing and acquiring debt , for the sovereign, one that uses it's own fiat money!, it isn't what it appears. Your government regularly spends before either issuing corresponding bonds or receiving sufficient revenue to cover the expenditure! You, nor I, can do that. The sovereign doesn't really borrow money. Rather it creates the money it needs and uses bonds for an entirely different purpose than borrowing. But of course the outward appearance is that of borrowing. The net deficit equals to the penny all the additional money created and spent into the economy beyond what has been received back in revenue which is exactly in line with your understanding.
When the sovereign creates and sells a bond money flows back to the sovereign and the bond represents a temporary reduction in reserve balances, a future liability of the treasury and the promise to expand the outside money in the economy by the amount of interest to be paid.* The sovereign can do whatever they like with the money they receive for the bond. They can store it on their books, or figuratively burn it. It doesn't matter, because there is an endless supply of money whenever the sovereign desires to pay an obligation or buy goods, services or assets.** When sovereign bonds are traded within the economy there is no affect on the amount of outside money. The transaction is simply a transfer on money from one reserve account to another.
Because the amount of money needed in an economy grows with the economy, the deficit will also grow with the economy.*** So long as an economy continues to grow the deficit will grow, eventually exceed the GDP and continue to grow still larger. This is a great puzzlement to those who look at a nation's ratio of deficit to GDP ,e.g., Japan, and wonder why the economy doesn't collapse, when in fact they are looking at a perfectly normal state of affairs.
In a world of fiat money, only if a nations productivity fails to keep up with the sum of money created, spent into and left in the economy by the sovereign will it be in financial trouble.
I have used the example of Zimbabwe many times because it is so instructive. When Zimbabwe was Rhodesia it was the bread basket of Africa and its farms were very productive. Agricultural exports produced huge revenue and provided all the foreign currency reserves its central bank needed for international commerce. When Mugabe's revolution succeeded, the farms were nationalized and broken into pieces that were awarded to his freedom fighters for their sacrifices. These freedom fighters knew not the first thing about farming and Zimbabwe's agricultural production plummeted. Government revenues also plummeted and foreign currency reserves were rapidly depleted. The government continued to print money, but as there was little to buy, inflation quickly set in; then hyperinflation.
Deficits in themselves are neither good nor bad. They are simply a part of maintaining the necessary supply of outside money in an economy. Underlying every economy is its productivity. I don't think it is too much of a stretch to say that after 1971 the world transitioned from a gold standard to a "productivity standard." The latter is much, much better.
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*QE is different. There the government sells bonds to the C.B. via the secondary market, primary dealers I would guess, which is the near equivalent of the government selling bonds to itself, and uses the money created in the process to spend into the economy. The money is raised at virtually zero cost just as it would be if the new money were printed without linking it to bonds. (A practice frowned on by crusty old economists, and so new money is linked to bonds, though it does not have to be). The bonds are held on the books of the Central Bank. Interest rates are pushed down by QE.
Later if it is found that their is an excess of outside money in the economy, the C.B. can sell the bonds in its inventory into the private economy temporarily removing, i.e., sidetracking, money from reserve accounts and pushing interest rates up. The C.B. also has the option of holding the bonds to maturity in which case, the Treasury and C.B. being different arms of the same body, the net transaction is virtually the same as if the Treasury had indeed printed the money and spent it into the economy the without linking it to bonds.
**In the U.S. for example, when the Treasury writes a check it will always clear regardless of how much money is in the Treasury's reserve account at the Central Bank. The C.B. will cover any shortfall by crediting the Treasury's account with whatever is needed.
***A little reflection on your part will convince you that it is impossible for the amount of outside money in the economy to increase unless spending exceeds revenue; there must be a deficit!