How To 

How to Invest and Upgrade your Shops in Fallout 4

Have too many things to trade and not enough merchants to trade them too because they keep running out of caps to pay you? Time to build your own merchants, and invest all those caps in them.

Step 1) Get the required perks to build and invest in your shops.
You are going to need rank 3 of caps collector in order to make investments in your shops, as well as build the best tier 3 shops you'll need rank 2 in local leader. To get the local leader perks you are going to need to have at least six ranks in charisma.

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Step 2) Build the shops and assign a settler to work in them.
Once you have the required perks, go to the settlement you want to set up as a bustling hub of commerce and get to building. Each shop you build is going to require that you spend a number of caps to get it started, depending on what kind of shop this can be as much as 3000 caps. If you have tier 1 stores and are looking to build tier 3, then you will have to scrap the old shop, there is no way to upgrade it.

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Step 3) Invest additional caps.
Once the shop is built and someone is assigned to work in it, talk to them and you'll be given the option to invest in the shop. This will upgrade the shop to a tier 4 and will increase the amount of caps they will have in order to buy things from you. There's a chance it can increase the quality of the stock they will have, but as the stock is random and constantly updating, it's hard to tell if there is an increase or if you are just getting good luck.

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Now that the shop is built, working, and fully upgraded and invested in, you are set to go! Now all you need is one of those elusive legendary merchants to come work in it.