If you find yourself running low on bottlecaps during your travels through the post-nuclear war wasteland of Boston, good news: Fallout 4 players have discovered an infinite caps exploit, and it's easy to do. Simply go to a vendor and buy all of one type of ammo. Sell one - and only one - ammo back to them, but do not finalize the sale. Sell the ammo again, in any amount that does not result in you having zero ammo. Your ammo counter should not go down, but your cap count should go up.
While this should work with any vendor, there is one stipulation to keep in mind: you can only increase your caps by the amount the vendor has on them. In other words, if you come across a vendor with 2,000 caps that they use to buy from you, you won't get more than 2,000 caps out of them. Therefore, I suggest finding a particularly wealthy merchant, and all the better if you find one carrying items you want. Arturo in Diamond City is a great choice, as he not only has a good amount of caps in his pocket, but plenty of powerful weapons and armor.
