. long-term liquidity measurement : net stable funding ratio ( nsfr ) for 12-month liquidity stress periods , citi uses several measures , including its internal long-term liquidity measure , based on a 12-month scenario assuming deterioration due to a combination of idiosyncratic and market stresses of moderate to high severity . it is broadly defined as the ratio of unencumbered liquidity resources to net stressed cumulative outflows over a 12-month period