How much, in your opinion, has international relations influenced the world economy and what do you think about it?
You have answered yourself in your own question. World economy consists of international relations. So it obviously "influences world economy".
Post 2008 economic crisis, america's TARP Bill was written by Chris Dodd, to bailout banks. At the time everyone assumed Dodd would author the bill in a way which put the self interests of the public first and foremost and that banks would suffer for endangering the global economy with toxic assets. Later it was determined that the process for authoring the bailout bill was Chris Dodd communicated with banks and the federal reserve. Dodd asked them what policies were best and banks received whatever they asked for. This type of disclosure on how the state offers banks and other special interests laissez faire / carte blanche to do whatever they want could be a motivation for Satoshi Nakamoto creating bitcoin--a currency for the people, rather than something created to benefit the establishment or special interests. Also it was later revealed the federal reserve profited something like $40 billion from managing the bank bailout bill. This might not be big news today but during that time when many were losing their jobs and committing suicide, maybe that helps to understand the conditions which might motivate someone to create something like bitcoin.
Centralized entities like banks wield a great deal of political influence on a global scale. The type of power they wield could supersede any notion of "international relations". An example of this are politicians who prioritize the interests of nations like china ahead of what is best for their own country. China centralizing the global steel market via utilizing predatory business practices would be bad for the united states and other major powers. Yet it is not difficult to see many would be in favor of this, even though it is bad for them.
There are social media campaigns in place which take precedence over "international relations" and in many cases, things people like SJWs support, trend in directions opposite to what is in their own best self interest.
Well it is US fucking government, and it is banks, and they are centralized shit. What else can one expect?
People do all this shit, and then there are people in Syria and other Muslim countries dying due to the Americans who have decided to fuck up everything that exists in the world. By Americans I mean American politicians, not the people. Even though the people are also to be held a little responsible for everything that happens.