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What do you think of a more modest change which would be to allow authors to choose between 100% SBD, 50/50 and 100% SP (adding the first option to the latter two which already exist)? This would provide some additional ability for the SBD supply to respond to demand, but not unlimited, which as you say is a bigger change.

I guess we'll touch the 10% "debt limit" before it could push dawn the price.

I'm sure that is possible but considering we are currently at 0.3%, we are so far from the limit as to make it difficult to say what the effect of getting from here to there might be. At least from my perspective it is difficult to say, you might disagree.

Actually I've suggested the same idea on Golos - sinse GBG is trading 3-4 times above the peg.
However this reverce conversion seem to be much more effective method.

This suggestion has merit I think.

Simpler to implement I think and simpler for the layman to grasp.

There can then be a push to get people to choose the 100% SBD option any time SBD value is too high relative to the dollar.

I think that's more moderate and adjustable change. 100% SBD sounds good.