Like much else about Pakistan, it’s often infuriatingly difficult to determine whether or not its economy is on the brink of disaster. This week, as the Pakistani rupee lost 5 percent of its value in just three days, it looked like trouble was brewing. And sure, this might be a sign of the economy slipping towards a balance-of-payments crisis. But, then again, it might not. Pakistan doesn’t just live on the edge, it seems altogether nonchalant about being there.