different between marketable vs merchantable

English

market +? -able

marketable (comparative more marketable, superlative most marketable)

Of or pertaining to marketability; capable of being marketed.
The quality and scarcity ensured that the product was eminently marketable.
saleable (of goods) or employable (of people)
- 2010, Gennady Stolyarov II, The Anti-Educational Effects of Public Schools:
  The massive unemployment rate among young people today can surely be explained at least in part by the manner in which public schools prevented them from obtaining many marketable talents and attributes.

merchant +? -able

merchantable (comparative more merchantable, superlative most merchantable)

Fit for the market, i.e. suitable for selling for an ordinary price. Sometimes, this is a technical designation for a particular kind or class.
- March 1858, Nathan Clifford in the United States Supreme Court, Leonard v. Davis 66 U.S. 476
  The defendants pleaded the general issue, with notice of the set-off, averring that but a part of the logs ever came to their possession, and of this part but a few were merchantable, the balance of them being worthless, and claiming damages for the inferior quality of the logs.

merchantable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

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