However, there is growing skepticism about the value of tied aid because it requires the recipient to use donor country suppliers that are shielded from competition and may not be the best. Tied aid can also slow the development of local suppliers in developing countries. These concerns led OECD members to untie financial aid to developing countries, no longer obliging aid-recipient countries to purchase equipment from suppliers in the donor country. However, China is using tied aid for nearly all its foreign projects.