If you change [[kingdom]], you will NOT lose the contract anymore, as long as you dismiss the merchant. This has been confirmed by Rudie, Garfunkal, and Longshanks(Hexd). If you fail to dismiss the merchant and switch kingdoms, you will not be able to take items off or add new items too it - but you will still be able to manage prices (Per Rudie).
Placed contracts do not change servers and will remain on the server where the merchant was placed until you return to it. Contracts which are not for placed merchants will transfer servers.
== Placing ==