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The HF 18 conditions of reduced rewards are not a natural market condition.

The HF 18 conditions of reduced rewards

What do you mean?

Because of HF 18, the payouts are all artificially low right now because the 30 day rewards pool is being 'filled'.

I don't see how this is relevant to witnesses setting price feed...

When witnesses artificially inflate the price of STEEM via their price feed, it causes the amount of SBD rewards that are available for post rewards to go up.