The phrase "commonplace assumption" is grammatically correct and commonly used in written English.
It is typically used to describe a belief or idea that is widely accepted or taken for granted by most people. Example: "In many cultures, it is a commonplace assumption that women should be the primary caregivers for children." In this sentence, the phrase conveys the idea that this belief is widely accepted and not questioned by most members of society.
It is a commonplace assumption, for instance, that they were undone by overly generous union contracts.
We should challenge the commonplace assumption that politics is an activity reserved for a narrow band of elites, and that voting is pointless.
I am disappointed to see Tripathi fall for the commonplace assumption that the Chinese spent three decades doing nothing, or suffering passively the blunders of their erratic chairman.
Contrary to the commonplace assumption that women speak more, there is now mountains of evidence, claims Cameron, that where status is not a factor there is no difference between men and women; where status does matter – such as office meetings – men talk much more than women.
That individuals have a taste for variety is a commonplace assumption, and the demand for variety in other spheres has been shown to be associated with income and education ([Behrman and Deolalikar, 1989]; [Gronau and Hamermesh, 2008]).
If salvation is his goal, his method in both Sum and his new book, Incognito, is to ask us to cast off our lazy, commonplace assumptions.
Both philosophers questioned the commonplace assumptions that there is a "reality" distinct from the ideas or perceptions given in experience and that it is within the power of human reason to discern that reality's true nature.
Studies of the past few decades — including "King and Messiah as Son of God" (Adela Yarbro Collins and John J. Collins) and my own "Sex and the Single Savior: Gender and Sexuality in Biblical Interpretation" — have overturned these once commonplace assumptions.
Depending on whether one retains commonplace assumptions about what we can think or about what there is in the world, the Parmenidean thesis can lead either to a bloated ontology or a very restricted psychology.
It was a sequence of events that seemed to call into question certain commonplace Republican assumptions — that what's good for Wall Street is good for America, that marginal tax cuts are a sufficient method of generating broadly shared prosperity, and that supply-side economics usually pays for itself.
Indeed, so commonplace is this assumption that it had already been satirised by Jane Austen nearly a century earlier: in Persuasion, Captain Harville says to Anne Elliot, "I do not think I ever opened a book in my life which had not something to say upon woman's inconstancy.
