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Actually, HBD is the subset of Hive, not the other way around. The amount of HBD available depends on the Market Cap of HIVE. If anything, a price dump on HIVE would hurt HBD!

I've actually read about this before (was it your article, possibly?). The 20% APR would decrease the demand of $HIVE but at the same time, it stabilizes $HBD which is very important as that has potential real-world utility.

In fact $HBD hold the value of $HIVE of drop more.

It took me a couple of reads but I think I get what you're saying. Staking and voting 🆚 simply moving HBD into savings. Amount of effort never correlates to amount of reward here or in RL, otherwise you would see maids in yachts 🛥️

Could it be that it discourages the purchase of other tokens?

Yep that was more of what I was going for. People would be dumping INTO HBD and care less and less about Hive because you earn nearly twice the amount in HBD then you do Hive.