To reach 500 Investors, you'll need to upgrade your existing residential buildings. Investors are the highest tier of population on Earth and require a wide array of goods and services. Initially, your residents will be 'Workers'. To upgrade them, you must fulfill all their current needs and then provide the next tier of goods. For Workers, this typically involves Processed Food (from Hydroponic Farms) and Functional Drinks (from Beverage Factories). Once these needs are met, you can click the 'Upgrade' button on a residential building to advance its inhabitants to the next tier, 'Executives'. Continue this process, providing more advanced goods like Communication Devices and Luxury Food, to eventually upgrade Executives to Investors. Remember to always have enough production to cover the increased demand from upgraded residents.
