for me and the player to make a 1:1 trade or a 2:1 trade (meaning i give 2 lumber for each crystal).
you must purchase or sell resources at a "reasonable" price. lets say that a player has some wine i want to purchase and i have more points that the other player. well that other player is a good friend of mine and wants to help me out and offers to sell me as much of the wine as i would like for 1 gold piece each. this could be seen as a form of "pushing". especially if this is repeated over and over again.
lets say that i am at 