Well, here is my very first blog! And, this is a tutorial on how to make Shops in Vanilla Minecraft! Now, before you actually start, you'll have to make a new Objective. Type /scoreboard objectives add dummy (Be aware that you'll have to set you're money). Once you have created that, you are able to start creating a Shop!

Find a good space for the Shop. If you want to make it big, find a flat space or just dig out a big space or, If you are just making Markets, then find small spaces. After you have found some land and built a place, you can actually start setting it up!

Grab a Command Block (You'll need to have Cheats on to be able to do this. The code is 137 but, in 1.8, it'll just be command_block). Then, place 2 Command Blocks down. Now, in the very first Command Block, put this command in: give @p[r=8,score_Money_min=] .

Then, in the next Command Block, type this: scoreboard players remove @p[r=8,score_Money_min=] . After that, get some redstone and connect it to a button or a preasure plate. People wont be able to spam this and get it infinite. Try giving youreslf the right amount of money and buy the item to make sure it works.

Sorry if this tutorial doesn't look like it is written that good but, it is my first blog :p Anyways, hope this helped out! :D