Declining mortgage interest rates helped boost home loan applications for a second week, as the summer selling season is underway.

Americans saw a chance to save a few dollars on their monthly mortgage payments and took it, pushing refinance applications up 40% versus a year ago.

“Rates typically move higher if job openings are higher than expected, all else equal,” wrote Matthew Graham, chief operating officer at Mortgage News Daily, adding that this data-driven volatility is nothing compared with what could be seen on Thursday following the government’s release of the monthly employment report.