Yes Farmer Bob still has an opportunity cost
His opportunity cost hasn’t changed it’s still 2 bushels of potatoes for every 1 bushel of carrots he grew.
Answer: Jottings.
Field notes generally use jottings as a means of jogging the researcher's memory. Jottings are quickly written short notes, annotations, memorandums,
None of these.
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I would recommend studying cosmology.
Cosmology is a sub-field of physics that is concerned with the Universe, its beginning, changes, law operating on it and its possible end- and the latter is what is interesting to you.