Why is it that one olive tree produces between 10 and 15 liters of olive oil....?

it takes a whole year to grow the olives. the watering, land and harvest cost which are expensive cause the tree grows in warm lands where there is not a lot of water..................... and still 1 liter of oil costs 2 dollars at your supermarket?Why is it that one olive tree produces between 10 and 15 liters of olive oil....?
Over 750 million olive trees are cultivated worldwide, 95% of which are in the Mediterranean region. Most of global production comes from Southern Europe, North Africa and the Middle East.





750 MILLION. That's a buttload of olive trees.





World production in 2002 was 2.6 million tonnes, of which Spain contributed 40% to 45%. In 2006, Turkey accounted for about 5% of world production, similar to the Spanish province of Ja茅n alone, well known for the biggest olive groves in the world. Of the European production, 93% comes from Spain, Italy, Greece.





Greece devotes 60% of its cultivated land to olive growing. It is the world's top producer of black olives and has more varieties of olives than any other country. Greece holds third place in world olive production with more than 132 million trees, which produce approximately 350,000 tons of olive oil annually, of which 82% is extra-virgin. About half of the annual Greek olive oil production is exported, but only some 5% of this reflects the origin of the bottled product. Greece exports mainly to European Union countries, principally Italy, which receives about three-quarters of total exports. Olives are grown for oil in mainland Greece, with Peloponnese being the source of 65% of Greek production, as well as in Crete, the Aegean Islands and Ionian Islands.Why is it that one olive tree produces between 10 and 15 liters of olive oil....?
Where do you get a liter of olive oil for 2 dollars?!?!