The phrase "on a macro scale" is correct and can be used in written English.
You can use it to describe a situation that affects a large area or is generally true. For example, "The global economy is improving on a macro scale, but some local businesses are still struggling."
As our governments at all levels pour more lawyers, guns, and money into this militarized marijuana prohibition, people still obtain it -- easily -- and supply and demand is totally uninterrupted on a macro scale; one dealer falls, another pops up.
Now the issue of the fifth-year number is playing out on a macro scale as one of, if not the only sticking point left prior to resolution.
It is not a large leap of the imagination to expect that we will one day be able to break down those social actions, studied on a macro scale, to biological reactions at a micro scale.
"The industry looks at the program on a macro scale," Mr. Becker said.
On a macro scale Mr. Fagan's meticulousness, unfortunately, isn't always so apparent.
On a macro scale, say coating a scuba mask, does the technology actually work?
Not just on, again a macro scale but at a very individual level.
An orderly pattern of device components (=sensor matrix) on a macro-scale area is required to realize such a function.
The key function for artificial skin is an instantaneous recognition of strain (pressure) distribution on a macro-scale area in response to mechanical stimulus.
Aqueous-DMSO solvent exchange of the PF−6 exchanged materials shows nearly reversible, but dissipative behavior on a macro-scale.
"It may be true that within various regions of the United States, partisan sorting has contributed to greater political homogeneity and, on a macro-scale, has accounted for the large swaths of red and blue regions coloring the presidential map," McKee and Teigen conclude.
