Recently much of the strategy research has emphasised resources internal to the firm as the principal driver of firm profitability and strategic advantages. Several studies showed that resources are specifically said to confer competitive advantages to the extent that the resources must be difficult to create, buy, substitute, or imitate (Pehrsson, 2000). Profitability is the result of interaction of controllable and uncontrollable factors. Among the uncontrollable factors are the economic and political environment, market growth or decline, inflation, etc. These uncontrollable factors could impose significant positive or negative impact on profitability (Loggerenberg et al., 1981). The impact should be measured in a way that allows knowing if the change in profit is due to the changes in the uncontrollable factors or the controllable factors