By PAUL WISEMAN and CHRISTOPHER RUGABER, AP Economics WritersWASHINGTON (AP) — Shutdowns of the federal government usually don’t leave much economic damage. The economic impact of shutdowns is usually fleeting. Federal workers get furloughed and the federal government delays some spending while they last. When they’re over, federal workers go back to their jobs and collect back pay, and the government belatedly spends the money it had withheld. Trump is also considering something more destructive: His budget office has threatened the mass firing of federal workers this time, not just putting them on temporary furlough.