For the Liao, Ryukyu was more like their good friend, sending a large number of things that the Great Song Dynasty did not want to sell to them, and the price was cheaper and the quality was better than that of the Great Song Dynasty.

Just like all kinds of iron products, as well as swords, etc., in the past, the Great Song Dynasty imposed a total embargo on iron tools on the Liao State, while the Ryukyu was a partial embargo, that is, an embargo on wrought iron and high-quality steel, as for ordinary pig iron and low-quality steel, it was supplied in unlimited quantities.

Then there is salt, there is also a coastline in Liao, but most places in Liao are not suitable for boiling salt, there are not many flat land, and where there is flat land, there is either no one, or it is too cold, and it snows for half a year.

Therefore, more than half of the salt in Liao is imported, and some were smuggled from the Song State in the past, but there are vast grasslands to the west of Liao, where a large number of livestock in addition to people also need salt, which leads to the high price of salt in Liao.

After the Ryukyu merchants came, not only the price of salt was reduced, but the quality of salt also improved a lot, and a group of salt merchants were contacted to sell salt to Western Xia and further west, so that the entire Liao country benefited.

The wholesale price of Ryukyu salt was very cheap, so cheap that it was almost the same as the cost price of boiled salt, which made the originally small salt farms of the Liao Kingdom even more unprofitable, and they began to switch to buying Ryukyu salt for sale.

The third thing in the Ryukyus is spirits, and the northerners like to drink in order to keep out the cold and adjust the boredom of life, and the spirits have better characteristics to keep out the cold, although the price is a little more expensive, but the sales are really very good.

The fourth best-selling thing is cloth, the cloth of the Ryukyus is densely patterned, the cloth is tight, and the price is also very affordable, almost the same as the price of the cloth of the local weavers in Liao, which leads to everyone competing to buy the Ryukyu cloth and no longer buy the cloth woven by the local weavers.

There is also entertainment snacks, this kind of thing is Zhang San's way of making a fortune, and now it has been opened all over the large and small cities of the Great Song Dynasty, and some large and medium-sized cities in Liao also have branches of Yixing Hutchison, and even these businesses have been done in Xixia and Dali.

In short, in the eyes of the Liao Kingdom, the Ryukyu merchants sold good things, bringing them a better quality of life, whether it was soap for bathing, whale oil for lighting, Ryukyu paper for writing, reading Ryukyu books, and even toilet paper made in Ryukyu.

Therefore, Ryukyu has unknowingly infiltrated all aspects of the Liao State, and through such infiltration, Zhang San also saw the reality of the Liao State, and the so-called ban on horse trafficking is simply a fictitious thing, just a tool for officials to collect money.

Zhang San can not only buy horses from herdsmen, but even buy trained war horses in the official horse farm, and even more exaggerated is that he can also use inferior horses to go to the military camp to exchange for high-quality war horses, which brings great convenience to Zhang San's cavalry plan.

Ordinary horses cannot be directly used as war horses, they must be selected and trained, this time is less than half a year or more than a year, and Zhang San, who bought a trained war horse, only needs to train these horses to adapt to the smoke and artillery fire of firearms warfare.

Although the Liao State has now lived in the city, and most of the Khitan people have also become masters, the state system and military service system of the Liao State have not adapted to this change, except for a small number of garrisons in various cities, the strength of the Liao State to fight the war still relies on temporary recruitment.

In the past, when the Khitan people were still living in the grassland, this system was good, but now the Khitan people have become landlords and live in towns, and some of the fat horses are no longer moving, and they are using temporary recruitment, and the combat effectiveness feels stumbling when you think about it.

But the monarchs and ministers of the Liao State didn't seem to be aware of this problem, they felt that they were invincible, the Great Song was like a herd of pigs, the Western Xia was now their dogs, and the nomads in the north were slaves who gave them horses and sheep, they were invincible.

The Liao State is now like an old tree that has been eaten by insects, and it will collapse with a slight push, no wonder the Jurchens can grow up step by step, and finally replace the Liao State in a short time, not because the enemy is too strong, but because they are too wasteful.

It's terrible to think about it, the Liao State is known as hundreds of thousands of people at every turn, and Emperor Tianzuo has even created an army of 700,000 and so on, so the peasant soldiers recruited temporarily are simply a copy of the peasant army.

So it's not unjust to lose at all, Zhang San sometimes thinks, can he also quickly destroy the Liao State, and then unify the north before going south? In the end, Zhang San resisted the temptation.

One is the cavalry problem, the other is the Jurchen problem, and the other is that taking these places will only become a burden to Zhang San in a short period of time and will not enhance the strength of the Ryukyus.

Liao is so dish, Zhang San simply feels that he is playing a real-time strategy game, he can do whatever he wants, Liao Guo recognized the market position of Ryukyu copper coins more quickly than the Great Song Dynasty, up to the princes and nobles, ordered the pawns of the peddlers, and now they only recognize the Ryukyu copper coins, and the Song money has received an unprecedented impact.

The Liao State originally had its own currency, but their currency could not withstand the impact of the Song money, and eventually the currency market was dominated by the Song State, and now the Ryukyu copper coins are more advantageous, so the currency of the Liao State is dominated by the Ryukyu State.

Think about how happy it is for a country to use other countries' currencies as coins and not feel the slightest problem, Zhang San's current cargo ships are all in addition to goods, and they will also bring a lot of copper coins to buy materials directly from the Liao State and transport them away.

For example, if you ship a boatload of toilet paper, this may not be worth much, and you won't be able to exchange much money after a boatload is sold, but you can bring a few boxes of copper coins, and when the time comes, you can directly spend money to buy leather goods, medicinal herbs, spices, precious trees, grain, horses, cattle and sheep and many other things in Liao, and then transport them to Ryukyu or Zhenwei Island, and you can exchange money.

According to the statistics of the Ministry of Commerce, last year there were more than 60 million coins from Ryukyu to Liao, of which the net outflow exceeded 30 million, which also made outstanding contributions to the coinage of Ryukyu.

Removing the cost, it is equivalent to Ryukyu levying 20 million yuan in taxes from Liao, and Liao's annual tax revenue is only this amount, as long as Zhang San continues to import currency to Liao, then Liao's blood will be continuously pumped by Zhang San.

Now the Ryukyus are gradually realizing the benefits of economic warfare, and the Ryukyus now mint more than 100 billion coins a year, making it the second largest industry in the Ryukyus after shipbuilding, and even counting the number of slave minting workers in mining is more than shipbuilding.

A team of ten people uses ten sets of casting molds, one set of molds can make twenty copper coins at a time, and more than 20,000 copper coins can be minted in a day. It is 8 million coins a year, and there are more than 10,000 such coinage groups in the Ryukyus, and more than 100,000 workers are employed in this alone.