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VESTS are basically STEEM POWER, you can take a look at this article to explain what the types of economic instruments are in steemit https://steemit.com/interest/@sigmajin/understanding-the-steem-economic-system-vests-sbd-steem-dilution-interest-and-all-those-crazy-things

Most useful @scalextrix - thank you for the link. I think I'm just managing to get hear round all the different terms now.

Dont worry about it, if it works sometimes you dont need to know every detail :)