Which of the following can be classified as a "Flow" variable?

Loss by a firm

Stock variables are those variables which are measured at a particular POINT of time whereas, flow variables are those variables which are measured over a PERIOD of time. Losses incurred by a firm is measured over a PERIOD of time thus considered as a "Flow variable", whereas, Bank deposits as on 1st oct 2017, Money supply etc are measured on a POINT of time thus, will be considered as a stock variable.