The markets have bumped up against the ceiling several times over the last two years. Today, it is selling off. If you dig under the footers of a building long enough, eventually the building (economy) falls over.
One of the major reasons that companies used to go public is that the public markets provided much easier access to large amounts of capital. The significant capital available from public markets was important to take a great idea and scale it to a level where economies of scale could be achieve