system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does more bandwidth cost more money when it is all just electricity over the exact same wires?
gpt
Data capacity.  That electricity you mention is carrying encoded information, and depending on the material and protocol used, is capable of transmitting _x_ amount of data at a given time.  Imagine you rent out part of your residence.  If you were to rent two of the bedrooms and a living room, wouldn't you want more than if you rented out a single room?  Thats because your house has a limited capacity, and you would expect that more of that capacity should cost more to be used.  The same is true of telecom and ISP providers.  They have a network that is capable of moving _x_ amount of data at a time.  If you want to take up more of that capacity, you have to pay more, because your use precludes another customer from using that capacity. The same is true for future capacity, in order to serve more customers the telco or cable co says, "oh, we see that 1,000 people want fast internet in Tallahassee, so we'll add some equipment/lines there, and that will provide 1 gigs/second to the internet, so we can sell each of the 1,000 people a 1mb connection, or sell 500 people a 1mb connection and sell 250 people 2 mb connections."  Im simplifying but you get the idea.

Edit: spelling.