Dutiful me: You have money which your kind Mama gave you for your birthday to buy shoes, and there is a pair you like. Buy them.
Book me: But there is that Dorothy Lyons I have not read on buy-it-now on ebay for less.
Dutiful me: But the shoes are pretty and you haven't had a new pair in a while.
Book me: The old shoes will mend.
Dutiful me: No they won't.
Book me: Summer is coming. I don't need shoes, and I have sandals.
Dutiful me: (struggling now) Yes. You do have sandals. Aha! It has started raining. You live in England. It rains. You need shoes.
Book me: You don't understand. I haven't read that Dorothy Lyons, and it is a very good price. It is not ex library. It has a dustjacket. There may not be another one along for ages.
Dutiful me: and what about your mother? Don't you think you should buy the things she's expecting you to?
Book me: She is the one who got me into books in the first place. Reading Wind in the Willows as a bedtime story is asking for trouble. How surprised can she be?
Dutiful me: You have done this before, haven't you?
Book me: Ahem.
Dutiful me: There is a limit to how many places you can go to wearing wellies.
Book me: There is?
Dutiful me: Yes.
Book me: But if I buy the book I would still have enough left over to buy some of those really cheap shoes in the factory shop......
Dutiful me: Which will last about six seconds. We've been here before.
Book me: But if I buy the book I would still have enough left over to get the old shoes mended.
Dutiful me: THE SHOES WON'T MEND!
Book me: Yes they will. And summer's coming, so I won't be wearing the repair out, and there's this really good cobbler....
Dutiful me: No cobbler is that good.
Book me: But I haven't read that book, and the last one of hers I read was really good and I'm sure that one will be just as good....
Dutiful me: Let's compromise. Let's not spend the money on anything for a while.
Book me: OK. If we wait a few weeks the shop will have sold out of that style, and you know how difficult it is to find shoes I like, and it will definitely be sandal wearing weather, and then.... there could be any amount of books out there that I haven't read. Easter the Showjumper! Crab the Roan! And there's nearly all the Patsey Grays...