AMMAN, Jordan — Jordanians hurled stones at riot police and chanted unprecedented slogans against the monarchy for a second day Wednesday as growing anger over price increases threatened to plunge the US-allied kingdom into a wave of unrest.

So far, King Abdullah II has steered his nation clear of the Arab Spring that has swept across the region, toppling the rulers of Tunisia, Egypt, Libya, and Yemen along the way. But Jordan’s massive budget deficit and other economic woes could increasingly push the population into the opposition’s camp.