I've read that the index is low due to too many ships, not lack of demand.
In free market economic theory, there is no absolute measyure, but supply and demand are always compare one to the other to set a market price level. Crashes occur when supply signficantly exceeds demand (including the supply that suppliers intentionally hold back from the market to manipulate prices higher). Crises occur when real demand of a vital product or commodity exceeds real supply by a signficant factor that those who suffer from the shortfall constitute a politically significant force.