In its December 2009 Consultative document, "Strengthening the Resilience of the Banking Sector" the Basle Committee on Banking Supervision noted it would continue to review the role of convertibility, including as a possible entry criteria in Capital Tier 1 and/or Tier 2 Capital. This consultation document obtains a proposal based on the requirement that the contractual terms of capital instruments will allow them at the option of the regulatory authority to be written off or converted to common shares in the event that a bank is unable to support itself in the private market in the absence of such conversions. This proposal should also have to reduce a source of moral hazard, seen by some as an underlying cause of the current financial crisis and a potential cause of future crisis.