Here is the clue for Final Jeopardy on April 28:
Category: HISTORIC WORKS' FIRST LINES
Clue: "The annual labour of every nation is the fund which originally supplies it with all the necessaries and conveniences of life"
On Jeopardy, they give you the answer. So your response has to be in the form of a question.
The correct question: What is the Wealth of Nations?
Two of the three players got it right. One said Das Kapital (which was by Karl Marx)
Jeopardy, April 28, 2017. Scroll down to the bottom for Final Jeopardy.