user47696: In this paper about Mt. Gox, it is said that:

By 2013, it was handling 70% of all bitcoin trading.

Doesn't it contradict the 51% rule, saying that if a single agent controls 51% of the bitcoin market, it will collapse?

user47808: @MaxSan is correct. Mt. Gox was only an exchange where people would buy and sell bitcoin. The 51% rule applies to a single entity (miner/pool) have 51% of the hashing power of the entire bitcoin mining network.  

47696: <p>In <a href="https://blogs.wsj.com/briefly/2014/02/25/5-things-about-mt-goxs-crisis/" rel="nofollow noreferrer">this paper about Mt. Gox</a>, it is said that:</p>

<blockquote>
  <p>By 2013, it was handling 70% of all bitcoin trading.</p>
</blockquote>

<p>Doesn't it contradict the 51% rule, saying that if a single agent controls 51% of the bitcoin market, it will collapse?</p>
 47808: <p>@MaxSan is correct. Mt. Gox was only an exchange where people would buy and sell bitcoin. The 51% rule applies to a single entity (miner/pool) have 51% of the hashing power of the entire bitcoin mining network.  </p>
