Kat Sloane could do with a shot of cash. She’s in debt to a nasty shark named Milky Kong, but her posh friends have a rule about money: it’s not fit for polite conversation. That means Kat’s getting on with plan B in Saira Viola’s “Monkey Fizz,” a poetic, richly depicted tale of manners and desperation. Or take Phil Trullo on New Year’s Eve. Before he can chill, he needs to knock out a couple errands. His boss might start to notice, for instance, if Phil keeps letting guys slide on what they owe.