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Not quite it's not US dollars it's Tether Dollars which is currency which pegs the dollar. I got caught out by that once.

it kinda gives the investor the overall value of the currency

Yes but it is more accurate to just look on Kraken or somewhere where they have an actual dollar pairing. The USDt doesn't always follow the USD very well.

Welcome to Steemit @mzie!

Here is some interesting info that will help you create AMAZING content. (Will change as Steemit grows)

How to Create Successful Steemit Content:

Reading & understanding the above posts will give the reader a SIGNIFICANT advantage on steemit.

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Good Luck!,
Weenis

When a man's knowledge is sufficient to attain, and his virtue is not sufficient to enable him to hold, whatever he may have gained, he will lose again.

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