Traveling is easier and cheaper than ever before!
With technology companies no longer need to travel
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There are fewer trade wars, er, there were fewer trade wars, so companies didn't really need to handle tariffs
With the existence of free trade it is much easier for companies to beome MNCs. Often in LEDCs there will still be huge brands because of how easy it is to sell products, not just in LEDCs, but everywhere!
Finally, global banking is a huge reason as it allows huge amounts of money to flow from country to country