The Basel Committee has published minimum requirements so that all classes of capital instruments fully absorb losses at the point of non-viability before taxpayers are exposed to loss. These new requirements have been introduced so as to avoid a future scenario, as has happened in the past, whereby the public sector can inject common equity funds into a distressed bank to support the depositors but which would otherwise have failed without such support. From 2013, any instrument which is proposed to be introduced as "Additional" (i.e. non-common) Tier 1 or Tier 2 capital, must meet or exceed these new minimum requirements set out by the Basel Committee. Transitional arrangements have also been specified.