The search results do not provide specific information about "Carteira do Investidor" at http://www.cdi.com.br or its LinkedIn page. However, based on the general context of similar companies, "Carteira do Investidor" likely offers services related to investment portfolio management, providing tools or advice for managing financial assets. Their target audience could be individual investors seeking to optimize their investment strategies. The unique selling proposition might involve personalized investment solutions or innovative portfolio management tools. Without specific details, these assumptions are based on common practices in the financial services sector.