However, forward-looking statements, by their nature, involve risks and uncertainties that could cause actual results to differ materially from those contemplated by the forward-looking statements. The risks and uncertainties primarily include those attendant with producing and marketing methanol and successfully carrying out major capital expenditure projects in various jurisdictions, including, without limitation:
-- conditions in the methanol and other industries including fluctuations in the supply, demand for and price of methanol and its derivatives, including demand for methanol for energy uses,-- the price of natural gas, coal, oil and oil derivatives,-- the success of natural gas exploration and development activities in southern Chile and New Zealand and our ability to obtain any additional gas in Chile and New Zealand on commercially acceptable terms,-- the ability to successfully carry out corporate initiatives and strategies,-- actions of competitors, suppliers and financial institutions,-- conditions within the natural gas delivery systems that may prevent delivery of our natural gas supply requirements,-- competing demand for natural gas, especially with respect to domestic needs for gas and electricity in Chile and Egypt,-- actions of governments and governmental authorities, including, without limitation, the implementation of policies or other measures that could impact the supply of or demand for methanol or its derivatives,-- changes in laws or regulations,-- import or export restrictions, anti-dumping measures, increases in duties, taxes and government royalties, and other actions by governments that may adversely affect our operations or existing contractual arrangements,-- world-wide economic conditions,-- satisfaction of conditions precedent contained in the Geismar I natural gas supply agreement, and-- other risks described in our 2012 Management's Discussion and Analysis and this First Quarter 2013 Management's Discussion and Analysis.
Having in mind these and other factors, investors and other readers are cautioned not to place undue reliance on forward-looking statements. They are not a substitute for the exercise of one's own due diligence and judgment. The outcomes anticipated in forward-looking statements may not occur and we do not undertake to update forward-looking statements except as required by applicable securities laws.
HOW WE ANALYZE OUR BUSINESS
Our operations consist of a single operating segment - the production and sale of methanol. We review our results of operations by analyzing changes in the components of Adjusted EBITDA (refer to the Additional Information - Supplemental Non-GAAP Measures section for a description of each non-GAAP measure and reconciliations to the most comparable GAAP measures).
In addition to the methanol that we produce at our facilities ("Methanex-produced methanol"), we also purchase and re-sell methanol produced by others ("purchased methanol") and we sell methanol on a commission basis. We analyze the results of all methanol sales together, excluding commission sales volumes. The key drivers of change in Adjusted EBITDA are average realized price, cash costs and sales volume which are defined and calculated as follows:
The change in Adjusted EBITDA as a result of changes in average realized price is calculated as the difference from period to period in the selling price of methanol multiplied by the current period total methanol sales volume excluding commission sales volume plus the difference from period to period in commission revenue.