Something I wrote earlier reguarding tech trading
One of the best way to make money in CN is tech trading. For a new nation tech costs $10,000/level. My nation has 85 tech, and tech for me costs over $30,000/level. Now lets say I wanted to get 20 more tech, wouldn't it make more sense for me to give you new nation, say $400,000 to give me 20 tech then to pay over $600,000 to buy it on my own. After the cost of buying my tech, you still get ~$150,000, and I save $200,000
There are two main ways to operate a tech deal, a 2-person deal, and a 3-person deal (In the following examples, you are the person selling tech).
A 2 person deal is the easiest. Someone sends you the money, and 10 days latter, after the aid slot expires, you send them back the tech. The downside of this is The person buying has to wait a long time for his tech.
The 3 person deal gets around this by adding a "middle man" Often the buyer will send you (the seller) the money, you will buy the tech, and immediately send the tech and a smaller amount of money to the middle man, who sends on just the tech, and keeps the money as payment for use of his aid slots. This gets the tech to the buyer much faster.
(Note, some buyers will put the middleman on the other side of the deal, sending him all the money, with the middleman keeping his cut and sending the rest to you. You then send the tech directly to the buyer.)
There is also the 4-person deal. You and a friend both arrange a tech sale. You each receive the money from your buyer, but then send the tech to the other person's buyer. This gets the tech to the buyers right away without a need to pay off a middle man.
Typically the buyer send the money first, since the selling nation usually needs to use to money to buy the tech. So, it's safe being a seller, since you get the money upfront. Do be sure to send the tech when you agreed to. Renigging on a tech deal is bad. You may think, he can't hurt me, he's far past twice my strength. Well, maybe he can't hurt you, but he can probably payoff someone who can.
Most tech deals are for 50 tech, as this is the most you can send at a time.