“It is clear that economics, if it is to be a science at all, must be a mathematical science.”
Source: The Theory of Political Economy (1871), Chapter I, Introduction, p. 38.
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William Stanley Jevons 69
English economist and logician 1835–1882Related quotes

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 36.

As quoted in Dictionary of Scientific Biography (1970 - 1990) edited by M Steck.

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

Acceptance speech, Alumni Achievement Award, Collinsville, Illinois. 2017.
“Economics is a social science, not a physical science.”
Part 1, Chapter 1, The Economy and Economics, p. 23
Economics For Everyone (2008)
There is an abstract rationale of all conduct which is rational at alt, and a rationale of all social relations arising through the organization of rational activity.
Source: "The limitations of scientific method in economics", 1924, p. 127 (2009 edition)

“Mathematics is the queen of the sciences.”
As quoted in Gauss zum Gedächtniss (1856) by Wolfgang Sartorius von Waltershausen; Variants: Mathematics is the queen of sciences and number theory is the queen of mathematics. She often condescends to render service to astronomy and other natural sciences, but in all relations she is entitled to the first rank.
Mathematics is the queen of the sciences and number theory is the queen of mathematics. [Die Mathematik ist die Königin der Wissenschaften und die Zahlentheorie ist die Königin der Mathematik.]

“Mathematics is the key and door to the sciences.”
As quoted in Building Fluency Through Practice and Performance (2008) by Timothy Rasinski and Lorraine Griffith, p. 64, but in fact a quotation by Roger Bacon: Et harum scientiarum porta et clavis est Mathematica, "And of these sciences the door and key is mathematics", from Bacon's Opus Majus (1267) https://books.google.co.uk/books?id=UfqcGd8NOFsC&pg=PA97&lpg=PA97&dq=%22porta+et+clavis%22+opus+majus&source=bl&ots=nGgt2Lhxqe&sig=88kIPB5EAKAKtm0APk6J5OrS1D0&hl=en&sa=X&ved=0ahUKEwiU36D2gIbLAhVBWBQKHSW9CKgQ6AEINDAE#v=onepage&q=%22porta%20et%20clavis%22%20opus%20majus&f=false.
Attributed

“Economics never was a dismal science. It should be a realistic science.”
[Samuelson, Paul Anthony, Puttaswamaiah, K., 2002, Paul Samuelson and the Foundations of Modern Economics, 10 http://books.google.co.uk/books?id=_Lvflq4Wv-wC&lpg=PP1&pg=PA10]
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