Rising property prices also attract speculators hoping to make a fast return. As speculators enter the market in increasing numbers, the probability of a bubble, and then a crash, also increases. The increased securitisation of mortgage debt created the means by which developers and speculators could build new properties, and sell them to high-risk, sub-prime, borrowers. The high-risk mortgage debt could be repackaged, and sold off to largely unwitting banks. This created an extreme form of moral hazard, which meant that many lenders blindly pursued short-term profits in the belief that their potential losses from loan defaults were fully covered.