Jennifer Anderson will sit in the lobby of other agents’ brokerages, waiting for answers on offers or counteroffers on behalf of her clients. That energetic persistence pays off in the ultra-low-inventory market of California’s Silicon Valley. She’ll farm a specific neighborhood, sending letters to home owners that introduce her buyers, asking if anyone would be willing to sell to them. Anderson’s team has also put together a “seller’s matrix”—a tool for buyers to see recent homes sold, the original listing price, a lineup of all offers, and the accepted offer. This helps buyers come up with a competitive offer. “The more data points they have, the more powerful they feel through the process,” she says.