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Profitability and liquidity are considered to be the most important issues in the corporate finance, in this study we investigate the effect of profitability, capital structure, and firm size on liquidity, and at the same time we test the impact of these variables on profitability, among a sample of 25 Algerian companies from 2013 to 2018, collected from the database of the National Center of the Trade Register (CNRC), via their online platform called \"Sidjilkom\". relying on the SPSS 21 with the application of the Multiple Linear Regression analysis. We have concluded that, on the one hand, profitability affects negatively liquidity. Whilst, leverage and firm size have a positive relationship with liquidity. On the other hand, we have concluded that liquidity positively impacts profitability. However, there is a negative influence of debt and firm size on the profitability.

In this study, we investigate the financial performance situation of the hotel service in a luxurious hotel in southern Algeria, through an analytical study by the measuring of profitability, liquidity, debt ratio in the period between 2013-2017. We have concluded that the profitability position shows an increasing trend till 2012. But in the last two years the ratio was negative because the hotel has recorded a deficit. While liquidity, is at highest level in 2010 and it begins a decreasing trend from till 2015. While, the Debt is at its lowest level in 2010, the ratio begins an increasing trend in 2011 and 2012 where records its highest level.