<p>I actually made a chart about which languages would be the most practical:</p>
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<p>…the first four columns have to do with these languages’ Wikipedias. In other words, their intellectual depth, as well as their prominence in terms of global Internet usage. The other three columns are self-explanatory.</p>
<p>In all columns, the higher up, the better.</p>
<p>The calculations at the end average their overall scores. The highest are the best, and the lowest are the worst. Keep in mind that this is skewed by non-economic/financial factors (i.e., intellectuality). If you’re concerned solely with GDP, just stick to the two relevant columns.</p>
<p>Of course, Japanese and Chinese are much harder for a native English speaker than the European languages. And if you’re more interested in Africa, French would make more sense, and, of course, go with Spanish if you’re more interested in South America.</p>
<p>The Japanese economy will likely shrink massively over the next couple of decades (due to its shrinking population), as will most European countries. The Chinese economy is likely to grow, and may eclipse the US economy within a couple of decades.</p>