A person who takes initiative, or perhaps one who is generous.
That person can be described as proactive, motivated, and driven. They are someone who takes initiative and strives to accomplish their goals.
There are several ways to describe such a person. Titles like "volunteer" or "leader" could work depending on the circumstance. Also, if a person does something without being asked, they are usually described as initiative (as in "taking initiative," "being initiative," or "having initiative").
Initiator
A self-starter is a person who takes initiative to solve problems, work without close supervision, and doesn't need to be told what to do on a frequent basis.
An initiative taker is someone who takes initiative to door say something whether they want to or not. Ever heard of the phrase, "If I want/need something done, I might as well do it myself?" That's an initiative taker. An initiative taker would say something along the lines of, "This has to be done, it might as well be me that does it."
a county ballot initiative to limit development in backcountry.
Individual initiative in anything, including economics, is when a single person decides to take some action, and does so.
You cannot "measure" initiative because it is a characteristic or quality of behaviour with no numerical basis. You can assess an individual's initiative by, for example, qualitatively gauging the efficiency and success of that person in solving a problem by it.
The root word for initiative is initiate. Initiate means to bring into being. Initiative means a person's readiness to act in an event.The root of initiative is -it-, meaning "goes." The latin word initium means "a going-in," hence " a beginning."
It is important to have initiative because that is the driving force that makes one want to do something. Initiative is defined as "an introductory step", according to Merriam-Webster's Dictionary Online. Employers look for initiative in employees because this usually means the individual has leadership qualities and will do what it takes to get a job done.
a person who organizes and manages any enterprise with initiative and risk.