I know there are many global liquidity indicators out there similar to this one.
This one just adds a little bit of more options for visualize different central banks and either stack data, see year over year changes, or visualize separate unstacked data.
Open-source script
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules.
You can favorite it to use it on a chart.
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