Still don't get it.
I watched that The Big Short and I'm sure it's a brilliant film and everything, but it completely lost me (in terms of understanding what the fuck was going on) about 20 minutes in.
I suspect that's why these banks and financial big shots continue to get away with it, cos no one else understands what it all means.
I borrow a milky way
[1] off you, and sell it at the tuck shop for 30p
[2]. I owe you a milky way now and I’ve promised to give it you back by lunch time
[3].
Then I cruise the playground and buy another milky bar for 20p (using some of the 30p I just got) and give that milky bar to you at the stroke of 1pm. Free 10p for me.
Now imagine I’ve sold your milky way at the tuck shop for 30p, but the only person who’ll sell me a replacement milky bar is one of the sixth formers and they want 50p for it. If I don’t get it now, the others could try and charge me 60p or (gulp)
a pound. It’s already 12:30pm and if I don’t give you your milky way back soon, your brother and his older mates will “get” me after school near the bus stop. If I buy the 50p one, I’ll end up down 20p
[4].
Essentially, reddit users have run round the playground in this scenario and bought every milky way this side of the staff room so now the only ones available cost twenty quid and the small boy in this scenario is either going to be out £19.70 (the 30p profit from selling the borrowed milky way minus the net cost of buying a replacement at twenty quid
[5]) or get his schoolbag thrown over the wall by your older brother
[6].
What I’m suggesting is that the schoolboy might borrow a milky bar from someone else to pay you back
[7], then try and buy a milky bar to repay
that lender next week. I’m also suggesting by next term (if I can wait that long) the price of milky ways will go back to normal and I can sell it at 20p and still make my initial 10p profit once everyone on reddit gets bored.