The principle of proportionality can apply in the first and third worlds. This can mean saving, looking ahead an allocating for future expenses, and the most important thing of all, giving back some of our blessings to the God who provides everything in order remember Him and to develop a closer relationship with our Creator. He will then instill a desire in us to spend time with, and love, our families, friends, and strangers, and put time and money into people out of love.
Proportionally, of course.