This is just an operation getting money out of XRP "investors" into Ripple Investors pocket.
Anyone with eyes can see the blatant fraud.
August 2014 1/5 of total coins became "circulating supply" and price and volume did not move.
Marketcap increased dramatically which it needed to fleece newbies of cash who done all the hard research of cryptocoins and found Ripple's XRP token way up there doing ok.
The number of freely traded xrp is really small as most available are locked up by contractual agreement.
How does the circulating supply become less every now or then, answer by cooking the books as crooks do.
(18 June 2017 "available" 38,290,271,363 XRP)
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by contrast, 80% of Bitcoins are freely available already not some imaginary 38% which in reality is less than 10%
Over 90% (including the once being part of the "circulating supply" which were gifted free to banks and partners with the condition not to sell before x time) still to dump on uninformed poor souls.