Lucy is up and making breakfast and Ethel delivers the mail consisting of notices that her utilities are unpaid. Suddenly she learns that there's no electricity and then discovers the phone is also disconnected.
Ricky gives her a good tongue lashing and decides to hire a business manager. The new manager, Mr. Hickox, doesn't fall for any of Lucy's ploys to get more money out of him for her allowance since he had to pay all the past due bills she's left with only $5. She pleads and begs and even threatens him but he doesn't budge.
Hating her position, Lucy happens upon another of her ideas. She'll do the grocery shopping for everyone in the building. She'll charge up all their groceries to the account set up by Mr. Hickox and they'll pay her in cash which she'll keep for herself and let Mr. Hickox worry about the bill at the end of the month.
Suddenly, Lucy is rolling in the dough and Ricky is stunned because he barely has enough money for a haircut for the month. He and Fred overhear Lucy ordering an item from the market, and think she's been dabbling in the stock market. Ricky takes this as a sign to fire Mr. Hickox and rely on Lucy's genius as a stock market trader.
Ethel reminds Lucy of the bill at the real market and she's panicky because the end of the month is drawing near and she spent most of the money she'd gotten from those she was shopping for.
Ricky returns with wonderful news, the little item he overheard Lucy order, can all pet he thought was Canadian Allied Petroleum stock. He'd invested and earned a winfall.
Lucy is in disbelief herself and doesn't know how to explain how she knew which stock to buy. She's relieved when Ricky gives her half of his stock returns to use as she wishes, now she can pay the big bill at the market.