Simplify the following text for a Grade 7 native English-speaking person.
Original: There are two types of FDI : inward foreign direct investment and outward foreign direct investment , resulting in a net FDI inflow ( positive or negative ) and `` stock of foreign direct investment '' , which is the cumulative number for a given period . Direct investment excludes investment through purchase of shares .
Simplified: The United States is also a leader in foreign direct investment .