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Forecasts to do difficult, but theoretically Litecoin system can be scaled to the size of the world. The more users on the system, the greater its computing power. This means that the total power can be brought to the world level - on the condition that litecoin will benefit more people than now.
Technical limitations, of course, there are, but the "top bar" are so far away that Litecoin as further expansion of the scale is quite able to match the power of the world's payment systems.