A kid wants to run a lemonade stand. But they need cash to get started.
Dad: I already gave you £5 pocket money
Kid: That’s not enough!
Dad: I tell you what. I have lemonade in the fridge. I’ll sell it to you for £3 to get you started.
Kid: Deal!
(Later…)
Dad: How’s the stand going?
Kid: Not good. I’ve sold nothing.
Dad: How much is it?
Kid: £3 for the lot.
Dad: I’ve got £3. I’ll buy it from you. And hey, now I’ve given you £8! This is a good business! You want to buy more lemonade?