quality or quantity?

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How many of you have encountered at the grocery stores or movie theaters or another places that a bottle of Coca-Cola of 2 l costs $ 0.99 and one bottle of Coca-Cola of 500 ml costs $ 1.19 Even worst a bottle of water from the same amount of 500 ml is $ 1.69. Why? how do they make these prices and i kinda understand with the water bc its healthier then sodas but in this case when i went to safeway the other night to make some groceries i just saw these 2 prices on soda and i was just simply...shocked.! i always went with the most expensive the better the product might be but in this case...i don't find a comparison.. Do you find one?