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That's great to know. Now this adds to my worry. If the APR will be decreased, this will create a massive selling for HBD thus will push the price below $1. What's your opinion on that?

I doubt there will be massive selling of HBD. There isn't massive amounts of it. But selling HBD means buying Hive, so it would be positive for Hive price. Many won't sell HBD significantly below $1, because they can convert HBD to $1 worth of Hive without engaging in selling/buying.