Once I've properly finished a book, my ideal state of being would be to never think about it again. But with 'Capital,' I felt I'd spent so much time with the characters that they were very, very real, and I definitely had a sense of loss about leaving them behind in a way I've not quite had before.
I think the Internet was invented specifically to stop people finishing their books. And it does quite a good job. I don't have blocking software, though I could easily imagine needing it. I just don't do that stuff until I've got the words done for the day.
Once you learn to 'speak' money - which is what I felt I did through the research that led me to write 'Whoops!' - you start to see it at work all around you. It's like a language, a code written on the surface of things; it's in flow all around us, all the time.