Opendoor Technologies Inc (NASDAQ:OPEN) shares are trading lower Monday afternoon, giving back some of last month's post-earnings surge as investors potentially rethink the iBuying company's path to sustainable profits. Here’s what investors need to know.Opendoor Technologies stock is taking a hit today. Why is OPEN stock dropping?Inventory Discipline Boosts Margins, Home TurnoverThe online home seller sparked a sharp rally in late February after fourth-quarter results topped Wall Street expectations. Opend ...