The world runs on electronics and semiconductor chips. Many of these chips are made in massive, multi-billion facilities run by foundries like TSMC, Samsung, and GlobalFoundries. 

Right now the world is going through a protracted shortage of these semiconductors. Especially in the case of TSMC, the most advanced foundry out there, there is only a limited amount of capacity available for all of its hundreds of customers. 

So why can't TSMC just build another factory? Obviously more factories need to be brought online. 

Just how hard can it be?