One of the frothiest stocks in the Philippines has plunged in recent days, erasing more than US$16 billion of its founder’s fortune and raising new questions about its remarkable ascent and sudden nosedive.Property developer Golden MV Holdings began falling on Thursday after regulators lifted a six-month trading suspension on the stock, continuing through Tuesday morning. So far it is down 76 per cent, its worst streak as a public company.It has also knocked Golden MV founder Manuel Villar off...