A scammer creates 1 CrapCoin and puts it up for sale on an exchange then his buddy buys the coin for $10. Since there are 1 million "craps" in the total supply, the market cap is 10 million dollars. Now tomorrow he will sell it back to the scammer for $15. Now he can claim that his market cap is 15 million and the coin has experienced 50% growth!!!
It's all true, but...
That's exactly what made XRP's market cap become worth over $33 billion dollar right now.
These fuckers don't only control the locked 60 billion XRP units, but they also control the majority of the circulating 39.6 billion XRP units. People as stupid as they are, see that XRP "only" costs $0.33 and for that reason hoard that what's left, and this made XRP rocket up like there is no tomorrow last year.
For a coin of which its market cap is $33 billion (including the locked units) it generates a damn low daily volume of $220 million on average. Even Litecoin generates more volume than XRP. EOS even generates like $700 million in daily volume while its market cap is significantly lower. XRP is an obvious case of how you can make yourself look like a large coin, but when you look at their volumes, their trickery gets exposed.