| MMT has nothing to do with any kind reserve currency status. The primary mistake most people make with MMT (and one which is continually enforced by both sides of the political media), is that they think it is a policy choice, or a "kind of thing a government does". If nothing else, please takeaway that MMT is a _framework for economic analysis_. You can apply it to any economy, you can use it to look at any policy decision, and you can work with this tool if you're a conservative or progressive. I find a lot of value in using it to understand China, Japan, emerging markets, economic history, etc. With relation to the original topic, the answer through an MMT lens is very simple. Nominally, there's no limit. A cornerstone idea of MMT is that a currency issuer can always purchase anything for sale in the currency that it has a monopoly over. Examples of these monetary sovereigns include the US, the UK, Japan, Australia, China. It does not include the EU, or most emerging markets (who effectively use another government's currency). The implication of this is that a monetary sovereign government has no binding constraints on the amount of debt it can issue (it can of course issue debt to itself if no-one else is around to buy it, i.e. Treasury -> Central Bank). Now that's not to say that government borrowing has no real limits. The most useful constraints to look at are real resource constraints (possible supply of goods and services), and external constraints (do you need to pay something in a currency you can't control?). If the government is purchasing more goods or services than the resource constraints are available to supply, you'll see an appreciation of prices (inflation). Simply creating more dollars doesn't lead to inflation. Fiat currencies are just units of account (think score points), not some kind of commodity. Japan's money supply has quintupled since 1990 to 2020 (from memory), while the consumer price index has been roughly flat, and the USD/JPY exchange rate has been roughly rangebound (wide range, but not a monotonic increase like one would expect if using intuition ) Rushed for time, but happy to discuss/debate points of contention. |