Well, I want to know exactly what it is that he was supposed to remember. And what does he mean, “It cost me money to forget!” It could mean:
(a) He lost money because he blew some business deal, because he forgot to go to a meeting or something. I think that’s what they mean here. But it can also mean:
(b) He paid someone or something to prevent him from remembering. He really had to pay some money, in order to forget! Perhaps Lacuna, Inc? In which case, we may have a prequel to write.
And what a thrilling invention we have in the Memindex. It’s a card file! It’s revolutionary! Also fairly expensive for 1948, but worth a thousand times more than the $5.75 you will pay. Those little 3×5 cards must be embossed with gold. Or they are magically enchanted and can speak to you: “Hey, you loser! Don’t forget that meeting with Johnson this morning!”
Thank you to Lisanne! at Flickr for the image, from Popular Mechanics (1948).