It sounds to me like this could be an essay debating the pursuit of education for learning's sake versus education for monetary success. If you must argue the side that we need to learn for the sake of the education, then you could include that the current educational system in America is not producing this effect. Most are taking the quickest and cheapest method to earn degrees which they hope will make them more marketable in the career world. I would even argue that there is a lack of critical thinking being taught in high schools and this is trickling toward colleges, which is only creating a saturated market of "educated" individuals who lack the ability to problem-solve and think. It's true, we do need "scholars" - but not in the traditional sense that a scholar is built simply by completing a degree program. There are plenty of degree holding individuals who are have made it through a college program and still have no idea how to think.
You could also argue that an education is more valuable than an immediate career. While many students go straight to a career from high school, a student with a college degree will earn far more and contribute better to the economic development of the country.
You might also consider writing the opposing view point to this statement. Many students cannot afford to attend higher education because they do not have the financial resources. One could argue that while scholars provide more lasting economic impact, there can be no scholars without dollars.
Of course, we can't write essays for you on this site. Can you tell us more about what your essay topic is so we can help you?
I'm wondering in what context you mean this. Is it supposed to be an argument that your country needs a better educational system instead of economic development? Are you writing about the US or about some other country?
In general, if you are arguing that you need education more than economic development, the best reason would be that education makes for better long term prospects. Economic development in the short term may come only in the form of low-paying jobs. By contrast, greater education might lay the foundation for much more growth in the future.