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Thanks for all the details. Can you explain this reinvestment point a bit more please?

If you read the new Addendum, you will see this is probably less important - probably! However, as the total SP of the system increases so everybody's max bandwidth decreases, so reinvesting rewards in SP will move the bandwidth down, whereas cashing out will move it up.

Don't forget that after HF19 the function is now linear. So yielding more SP does not represent an exponential effect anymore.