Investor

Investor is a perk that becomes available when you reach 70 in the Speech skill. Using this perk allows you to invest 500 gold coins in certain shops and Merchants (Skyrim).

This means that the shops you have invested in, will have 500 gold more to barter with.

You may also invest in the shop that your spouse owns.

Exploits
In a unique case, Riverwood Trader owned by Lucan Valerius, will have a sum of 10.000 gold and more.

Bugs
With Merchants (Skyrim) listed below you can make unlimited Investments, but they might not restock more then 500 gold. (confimation wanted)
 * Angeline Morrard in Solitude
 * Warmaiden's in Whiterun (City)