Should i comment the answer or add another answer referring to the original poster? See this case for example: Is the government a producer, a consumer, or both?
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$\begingroup$ What kind of information? Towards answering the question? $\endgroup$– Alecos PapadopoulosAug 15, 2017 at 13:51
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$\begingroup$ I just added an example in the main question $\endgroup$– JoaoBotelhoAug 15, 2017 at 14:06
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1 Answer
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In principle, anyone can edit an answer by anybody else, to include additional material, but I haven't seen it happening on any site, probably out of respect for the original author of the answer. Usually, a comment below an answer suggests to the author some additional info/data/result that he could include in his answer, and then it is up to the author to do that or not.
Regarding whether to post a separate answer, mostly it boils down to the length of the additional contribution. In the example you provide, your answer is more of a comment below my answer, rather than a separate answer (and have in mind that comments, although officially looked-upon by the SE approach, are avidly read by users).
And by the way, since my answer mentions roads-infrastructure, why do you think it does not include the investing activities of the government?
answered Aug 15, 2017 at 14:13
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$\begingroup$ Thanks! In my case, using roads again was a bad example - it could be a military base, hospital, school. I wanted to tell that there is yet a third role of the government, which is to be an investor itself, without being a producer or consumer. $\endgroup$ Aug 15, 2017 at 14:38