Studies using test P-value to evaluate the reliability of the correlation and Multivariate regression analysis to estimate the extent of the influence of the use of debt to operating efficiency. The results showed that the level of use of high debt loans adversely affect the efficiency of the lucrative businesses, in the meantime, the use of the loan debt and owe no interest loans reduce the solvency of enterprises. In addition, the study also found a contradiction on the impact of debt to asset management efficiency, in particular the level of use of the loan debt has a negative influence of rotation fixed assets and total assets, while that level using the debt does not have to pay the higher interest rate will increase the target of this rotation.Javad Afrasiabi and Hamed Ahmadinia (2011) study the effects of the way in funding to the capital structure for the enterprises listed on the Tehran stock exchange in the period 2006-2009 through the use of capital pricing model and the theory of capital structure. Accordingly, the business was divided into two groups: (1) the business capital structure in favour of debt and (2) the business capital structure in favour of equity, since it determines the risk and profit expectations of two group using the capital asset pricing model, and compare the results.Use control F Levine, T student and the other test, the results are as follows:-Does not exist in the relationship between the way of funding and the profits of the business, consistent with the theory of M & M in conditions of no taxes, the use of debt has reduced the impact on profits.
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