What is the cheapest form to transport rock salt and limestone?

Ships or trains

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classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane