The price of coffee is increasing faster than any other household grocery, and it’s not just tariffs driving the surge — bad weather, war and a frenzy of market traders are also to blame for the rise. Coffee prices have spiked by a stunning 18.4% in the last year, according to federal data from February. Most other household spending items — from groceries to cars to haircuts — don’t close to that increase rate, figures from the Bureau of Labor Statistics show. Those increases have affected both producers and consumers, and reflect a trend that has been running wild since...