I don't think the definition of effective is relative. I believe people can have different goals though, so actions that would be effective to one person aren't

I don't think the definition of effective is relative. I believe people can have different goals though, so actions that would be effective to one person aren't to another. I don't think it's moral for your goal to be help those in your community at the expense of everyone else. Therefore if you are making moral decisions effective means the choice that will cause the most good per resource.