Americans consume about 3 billion pounds of chocolate annually, but consume less per capita than Europeans. Sixteen out of twenty of the top chocolate consuming countries (per capita) are European. Chocolate consumption is seasonal. People tend to consume more chocolate during Winter time. Prices for chocolate have nearly doubled since 2006, due to crop shortages, and increased consumption of chocolate (especially of dark chocolate, which requires more cocoa). 
Chocolate must be processed from cocoa powder, cocoa butter, and sometimes other oil products. Companies like BT COCOA, Barry Callebaut, Cargill, and Archer-Daniels-Midland Company (ADM) buy cocoa in bulk from Cote d'Ivoire, Ghana, Indonesia and a few South American countries, then process and sell it to confectioners like Hershey Foods (HSY), Nestle (NSRGY), Mars, and Cadbury Schweppes (CSG) , to melt, mold, and package. Demand for chocolate directly creates the demand for cocoa, while the supply of cocoa is contingent on the production of African and South American farms.
Currently, the world's top five cocoa producing nations are the Ivory Coast, Ghana, Indonesia, Nigeria and Cameroon, which together account for 70% of global cocoa production each year. 
In July 2008, demand for cocoa powder exceeded supply more than it has for 20 years as companies placed increasing numbers of orders for cocoa powder while suppliers were producing less. This situation means that prices of cocoa will increase further until increasing chocolate prices decrease cocoa consumption and lower demand. Supply and demand of cocoa are measured by the stocks to grinding ratio. A low ratio means that there is not a lot of cocoa powder to sell and grinders are working at capacity to meet demand.  As of June 2008, cocoa prices had risen 50% from the previous year, hitting a 28 year high. 
More demand for chocolate increases the price of cocoa, which is chocolate's primary ingredient. Demand for chocolate increased by 20% between 2002 and 2007, as measured by consumption. 
Increased standard of living in India and China are creating demand for chocolate bars, which used to be considered an elite luxury item. Because of their massive populations, these countries could drive up demand for chocolate and increase the price of cocoa. Chocolate consumption in India, China and demand has been increasing by 15-20% annually. 
If the the world's governments act against child slavery and widespread human rights violation in Cote d'Ivoire and Sub-Saharan Africa, the price of cocoa will rise. Below poverty wages and the use of child labor keeps the price of harvesting cocoa down. Reports of up to 200,000 child slaves busy harvesting cocoa has raised humanitarian pleas, but no significant action has yet been taken to improve working conditions in the Ivory Coast.Once the humanitarian crisis in Darfur is resolved, the UN will have more resources to deploy in Africa. Cote d'Ivoire would be a logical next step for intervention. When workers receive proper wages and working conditions, African production costs will increase, and raise cocoa prices.
Intervention in the Ivory Coast (and Africa in general) is made difficult by regional instability. Cote d'Ivoire almost had a civil war in 2002, and is still in a precarious political situation. The country also produces 46% of the World's cocoa. If conflict breaks out, expect cocoa prices to go through the roof due to destroyed or unharvested crops and damaged shipping infrastructure in Africa.
Small crops in cocoa producing countries lower the supply of chocolate. World chocolate consumption is increasing, so the price of cocoa increases. Destructive diseases, such as black pod disease, and adverse weather patterns have plagued cocoa yields in Africa for the past 15 years, losing growers $700 million annually. 
This year, adverse weather and disease have struck once again, and cocoa prices have skyrocketed due to shortage. Due to an overabundance of rain, Cote D'Ivoire is expected to produce 1.1 million metric tons of cocoa for 2008/09, down 20% from last year's 1.38 million metric tons. Indonesia is also expected to produce less cocoa this year, at 490,000 metric tons (down 5,000 from last year). Production increases in Ghana and Cameroon can't close the gap, and worldwide cocoa production is expected to drop 7% to 3.456 million metric tons for the 2008/09 crop year.
The director of Ghana's Nature Conservation Research Council, John Mason, believes that African cocoa may be extinct in 20 years due to irresponsible growing practices and resulting soil erosion in Africa. 
Increased publicity of cocoa's antioxidant content may entice people who value their Health & Wellness . Cocoa contains far more antioxidants (which can prevent stroke, cancer, and heart disease) than any other food. For a while, people were encouraged to drink red wine for the antioxidants. A cup of cocoa has twice as many antioxidants. 
More demand for other sweets that could substitute for chocolate could lower cocoa prices. This demand for other sweets may arise precisely because of increased chocolate prices, though. These sweets could include cakes, hard candy, and non-chocolate cookies.
Not nearly as much genetic research has gone into cocoa as other foods. The Mars Company is spearheading research into the cocoa genome to make more pest, disease, and sun-resistant cocoa crops. Cocoa used to grow best in well shaded areas, until genetic research made cocoa plants considerably more sun-resistant. African farmers also need to implement better crop rotation, and farming techniques to improve their yields.  As cocoa farming becomes more technologically advanced, there will be more cocoa on the market, driving prices down.