Time to talk bank earnings.

JPMorgan Chase (JPM - Get Report) , Wells Fargo (WFC - Get Report) , Citigroup  (C - Get Report) , and Goldman Sachs (GS - Get Report) are reporting earnings before the bell Tuesday, Oct. 14. 

Jeff Marks, senior portfolio analyst with Jim Cramer's Action Alerts PLUS portfolio, broke down what he's watching when the banks report earnings. 

Watch for the one metric that Marks is keeping a close eye on before the banks report.

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