Core sales excludes the impact of acquisitions, divestitures and foreign currency translation. Management believes that core sales facilitates easier comparisons of our net sales performance with prior and future periods and to our peers. We exclude the effect of acquisitions because the nature, size and number of acquisitions can vary dramatically from period to period and between us and our peers, and can also obscure underlying business trends and make comparisons of long-term performance difficult. We exclude the effect of foreign currency translation from this measure because the volatility of currency translation is not under management's control.
Adjusted Net Income and Adjusted Earnings Per Share
Adjusted net income and adjusted earnings per share (calculated on a diluted basis) exclude actuarial gains and losses on pension and postretirement benefit obligations, restructuring and other similar costs, gains or losses on divestitures, gains or losses on extinguishment of debt, the impact of inventory fair value adjustments in connection with purchase accounting, and other non-operational, non-cash or non-recurring losses, net of their income tax impact. The tax rates used to calculate adjusted net income and adjusted earnings per share is based on a transaction specific basis. We believe that adjusted net income and adjusted earnings per share are useful in assessing our financial performance by excluding items that are not indicative of our core operating performance or that may obscure trends useful in evaluating our continuing results of operations.
EBITDA represents earnings before interest, taxes, depreciation and amortization. EBITDA is presented because it is an important supplemental measure of performance and it is frequently used by analysts, investors and other interested parties in the evaluation of companies in our industry. EBITDA is also presented and compared by analysts and investors in evaluating the performance of issuers of “high yield” securities because it is a common measure of the ability to meet debt service obligations. Other companies in our industry may calculate EBITDA differently. EBITDA is not a measurement of financial performance under GAAP and should not be considered as an alternative to cash flow from operating activities or as a measure of liquidity or an alternative to net income as indicators of operating performance or any other measures of performance derived in accordance with GAAP. Because EBITDA is calculated before recurring cash charges, including interest expense and taxes, and is not adjusted for capital expenditures or other recurring cash requirements of the business, it should not be considered as a measure of discretionary cash available to invest in the growth of the business.