You can still do all those things on the Pentium 4 (boot up Windows XP, install Morrowind, use MS Office 2000 or whichever version was current, watch The Matrix), but the cost to buy the PC is significantly less (even taking into account the second-hand nature of the PC).
It isn't comparing like to like to compare the cost of a modern PC to one 20 years old, with modern games, modern websites, modern Office products etc.
It isn't comparing like to like to compare the cost of a modern PC to one 20 years old, with modern games, modern websites, modern Office products etc.