Building an Investment Portfolio for your Kids on a Budget By Marlo Richardson   Investment portfolios probably don’t rank too highly when it comes to lists of topics that kids discuss on the playground or in the lunchroom. However, given what is known about compounding interest and getting an early start with investing, building a portfolio early is becoming more commonplace.  A Little Goes A Long Way It is still a pervasive myth that to invest, either for yourself or your kids, you need to be wealthy, to begin with. But, you can start an investment portfolio with a few hundred dollars. This low barrier to entry makes kicking off a…