Richard, I'm struggling with the economy in this game. Unlike Call of Cthulhu you don't abstract away money - investigators get more money after each Investigation.
But there doesn't seem to be any "standards of living" expenditures - instead you gain ever-more money (actual specified dollar amounts) until you have enough to buy everything on the equipment list. Unless an adventure makes a deal out of needing to pay for something expensive in order to proceed with the plot, tickets on the next steam ship to Egypt, purchasing a rare book or whatever, there doesn't seem to exist any reliable "money drains".
How do you handle money at your table? What expenditures did you have in mind when you decided to hand out $40 (or $20 per point of Social Standing, the rules say two things) after each adventure?
Did you simply assume each investigation finds creative ways to charge each Investigator roughly $40 on average, to keep money roughly the same assuming no windfalls or disasters?