That`s the right answer. Both parties must have the means to support the agreement and your trading partner probably does not have the money. Depending on the ill will of the agreement and the amount of extra coins I have, I simply offer them a gold package so they can afford the deal. As in previous versions, cities remain the central pillar of civilization gameplay. A city can be based on a site desired by a unit of settlers manufactured in the same way as military units. The city will then increase in population; Production of units and buildings; And create research, wealth and culture.  The city will also expand its boundaries by one or more tiles at a time, which is essential for the claim of territory and resources. The expansion process is automated and adapted to the needs of the city, but the tiles can be purchased with gold.   Use this research to have a great militaryIn addition to technology, update units with gold and make sure they meet your new standards. Just add strength and have some Ranged Units. Although the pikemen are not very tall, they have a good fighting force that increases your military score. Look at the demographics of the screen and are not last, but 3-5th in a game of 10 players. AI has “disagreements” with tiny civs, even though they have never really fought in the past.
They like to screw you up when you`re small and weak. Also build new units as they become available. You want to gradually grow your military during the game, but don`t need to be #1. It is easy to defend in your own countries if you have enough troops. Note how I had set up a fortified line to protect my country in one of the screenshots above. Babylon was quite friendly, but things can turn back to the worst if you start winning by building spaceship parts. Castles, etc. in your cities, are also a deterrent. In this game I built Neuschwanstein which promotes certain defenses and offers luck in the melody of 8-10 in total for 3-4 cities. Civilizations can no longer trade with technology, as in previous versions of the game, instead civilizations can carry out common technological enterprises. Two civilizations at peace can form a research agreement that requires an initial investment of gold and provides the two civilizations with a certain amount of science as long as they remain at peace.
 Before the PC 22.214.171.1242 version of the game, civilizations were equipped with unknown technology after a series of twists and turns of uninterrupted peaceful relations. It is possible for a civilization to sign a research agreement just to get an enemy to spend money that could be used for other purposes; AI civilizations are programmed to sometimes use this tactic before declaring war.  British actor W. Morgan Sheppard delivers the story for the opening films of the original game and its expansion packs, quotes on the discovery of new technologies and the construction of tourist sites and the introduction of the player`s chosen civilization at the beginning of each new game.  List of all buildings related to science. I`ll show you a list of all the science buildings with the necessary technology, the production they need for construction, and the basic gold costs to buy them directly. Plan ahead and save gold to buy science buildings in your cities, you can make an immediate leap in research and help you advance other Civs in the race for all the techs (or even further). This gold economy strategy is especially useful if you are not able to produce it quickly, because cities that focus on science will have a lot of farms and fewer mines, so they will generally have reduced production compared to other cities. After all, you want the population more than anything, and as time passes the gold becomes easier to acquire.