It's 2100-ish and we're experimenting on our new time travel device, or let's say time travel bunker. What we gathered of information so far are:
- We can't really go back in time, literally. Every time we visited the past, we got into a new dimension identical to ours to the point the visitor arrived. Then, it just changes direction chaotically, but nothing really changes on our timeline.
- Huge amounts of energy are used to visit this new dimension for the first time, although revisiting it demands a lot less.
- Weirdly enough, it's cheaper to explore this new dimension than to explore space and new planets.
- We can bring back goods from that dimension as efficiently as we can carry stuff there.
- We can't go forward, no matter what we try to do.
The higher ups are not that happy. They hoped they could win the lottery a few times I guess. The board members were afraid we would get shut down and devised a plan to rescue all the investments made on the project.
As we know now where all the natural resources are we could just go there and get it. And let's be fair, we could use some. Since the construction of the mega cities started, we've been on a major shortage. The thing is, when should we go? I mean, to what age should we go harvest resources?
It would be easy to say "just go now and gather that brand new duplicated nuclear frost free refrigerator", but I don't think we would be welcomed there. I mean, I would shoot dead anyone trying to rob my toaster and I don't think the military would allow any of that. It would be a large scale war between two identical forces.
We need to think of a time where resources were readily available and we could outmatch the military. The balance on that question is the answer.
Valuable goods: almost anything goes. Think of what is valuable today, as in high price stuff. More readily resources like already processed steel and gold ingots. Also art, high tech computers (large amounts as in warehouse full of it), uranium ready rods, etc. The thing is, the more advanced the better resources we can find, but it'll be harder to harvest since the military would be a hard match to overcome. Not limited to those, you get the idea I hope.