Which term refers to the type of buying and selling that takes place within a country a free trade b international trade c productivity d domestic trade

D) Domestic trade refers buying and selling that takes place within a country.

Domestic trade is also otherwise home trade or internal trade and it is described as an exchange of good manufactured within the country's boundaries. There are two categories in domestic trade and they are retail or wholesale.  

Wholesale trade is about buying goods in bulk from the manufacturer to distribute to smaller retailers in small quantities. Only wholesale agents' commission or wholesale merchants can perform wholesale trading. Retail trade describes selling or distributing goods in smaller packages to the consumers.

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question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals