Does Small Scale Have a Hyphen?

In "small-scale study," the hyphen clarifies that the study was small in scale, not a study on scales designed for mice. If one of your modifiers is an "ly" adverb, a hyphen isn't needed.

Should large scale be hyphenated?

Predictions from large-scale global climate models can be a valuable resource for city planners. Note: When the adjective follows the noun, the words are NOT hyphenated. Examples: ... [In these cases, "well known," “up to date,” and "large scale" follow the nouns they're modifying, so they are not hyphenated.]

Is Small Business hyphenated?

The hyphen makes all the difference in phrases such as “small grain” and “small business,” too. ... You need the hyphen in these examples for a couple of reasons: to avoid confusion about your meaning and to form a compound modifier. A compound modifier is two or more words strung together to express a single concept.