FFXIAH.com
Select "Hades". Check out items. See how frequently they are sold, and how many are for sale. Look at the history chart for volatility.
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If you just ask people, those who are bad at AH and making gil will say things are horrible, while those who are good will tell you things are just peachy. If you pick for yourself 20 benchmark items and see how they are, you can decide for yourself how does the economy look for you.