The so-called economic law, to put it bluntly, is a matter between businessmen, Qin Hao is quite familiar with this, or that sentence, he has never eaten pork, and he has always seen pigs run.

In the previous life, we lived in the 21st century when the commodity economy was developed, and the economic law was even more important than the civil law, and the spirit of contract in the Tang Dynasty was so strong that the observance of credit commitments was simply outrageous, so most of the economic disputes in later generations simply did not exist in the Tang Dynasty.

Therefore, all he needs to do is to think about how to set up laws and regulations to make Datang stronger and the market more dynamic.

At present, the economic status quo of Datang is that the Qinggang basically monopolizes the river transportation and shipping business of Datang, and the wholesale business is basically strangled through the supermarket, and the top priority is to limit the price and profit of the Qinggang to buy and sell, so Qin Hao strictly stipulates the price of the Qinggang when it is purchased from the factory, so as to ensure the profits of the manual owners, so that they can flourish.

For this reason, Qin Hao even preliminarily drew up a plan for commercial tax reform, planning to discuss it with Fang Xuanling and them when it was perfected.

Another more frustrating place, Qin Hao actually set the legendary tariff for Datang.

This grand cause almost completely provoked Qin Hao's excited nerves, the so-called tariffs, of course, are not artificially set up trade barriers, every international trade in feudal society is not easy to come by, and he is not a broken bed, how can he take the initiative to fight a trade war.

The tariff is very low, whether it is sold to a foreign country by a domestic merchant or sold by a foreign merchant to a foreign businessman, he has to pay a little, the key is that he only accepts general coupons for the settlement method.

To put it simply, foreigners who sell things in must and can only buy and sell them into a bunch of general coupons, deducting the part that needs to pay taxes to Datang, and the rest can be used to buy things and sell them back to their home countries.

And if the local merchants are willing to go to the Western Regions to sell things to foreign countries, the best choice is to exchange for general coupons and come back, otherwise they will have to pay taxes if they come back after changing things.

When he completes this great cause, all the alien races, especially those who revere the Heavenly Khan, will have to reserve a large amount of Datang's general coupons, simply put, foreign exchange reserves, think about why Lao Mei in the 21st century can make the world take medicine with a sneeze, isn't it because he owes the world money?

If the same trick can be used in the feudal society a thousand years ago, its utility will inevitably be countless times better, because the alien race itself does not have a complete monetary system, when their commercial contacts with the Tang Dynasty become more and more frequent, the internal circulation currency will naturally be replaced by the general coupons of the Tang Dynasty.

To control a country's currency is to control everything in that country, and although this economic view is simple, it does not have a certain amount of truth.

Even if Qin Hao is a little more shameless, he can completely build a foreign exchange coupon system on top of the system of general coupons, and build a foreign exchange coupon system on this basis, completely isolated from the domestic market, and then just printing foreign exchange coupons can squeeze out a country's economic potential.

At that time, the Tian Khan system must be as stable as Mount Tai, if anyone is a little stabbed, they can be cleaned up by monetary means alone, and it won't even take long, and it will not be difficult to annex it directly.

Not to mention, how many banknotes can Datang print out in this way, you must know that for the treasury, the extra part printed is money.

The knowledge involved in this is too professional, involving macroeconomics at the national level, Qin Hao, a civil servant, only has a rough understanding of the surface, and these bigwigs in Datang are naturally even more cloudy and foggy, and they don't know why at all.

So Qin Hao taught the bigwigs a lesson very vividly and taught them what economic plundering is.

Organized by Pei Xingjian, Wang Fangyi and a group of cannibals led the first voyage caravan of the Tang Dynasty, which set off from Dengzhou and headed straight for Pyongyang City, using the porcelain, silk, lacquerware and other items abundant in the Tang Dynasty and precious commodities such as jewelry, rhino horn and spices from the Western Regions, to carry out cordial and friendly exchanges with the local merchants and clans of Goguryeo.

Because of the productive forces, the Goguryeo region can be said to be very poor and white, and even a needle is difficult to make in them, and the impact of these large ships of goods on them can be imagined.

Since then, the Tang Dynasty and Goguryeo have established trade relations, because after all, the two countries have not yet torn their faces, and Goguryeo is still a vassal state of the Tang Dynasty at least nominally for the time being, and it is still a tributary heavenly khan, so it is impossible for Goguryeo to turn against the Tang Dynasty.

The Goguryeo people soon discovered that it was much more convenient to trade with the general coupons of the Tang Dynasty than to barter directly, and even more suitable than to trade with gold and silver, so a few months later, if they wanted to buy the goods of the Datang Dynasty, they had to have the general coupons of the Datang Dynasty, and even in Goguryeo, the value of the general coupons was even more than that of ordinary copper coins.

As a result, Goguryeo's minerals, timber, mink, and boats were shipped to Datang, and all Datang paid was boatload after ship of general coupons.

Later, all the copper coins in Goguryeo were exchanged for the Tang Dynasty, and even the copper in Goguryeo almost withdrew from the currency market, and boatloads of gold and silver were shipped back and directly sealed in the treasury of the Tang Dynasty.

Anyway, Qin Hao said that there is no need to think too much about the money printed to foreign countries, especially this kind of money that can be directly exchanged for gold, silver, copper and iron.

Li Shimin, Fang Xuanling and others were completely stunned when they saw the results of Qin Hao's experiment, they did almost nothing, and they emptied the folk wealth and even the national wealth of Goguryeo, of course, during this period, hundreds of ships of goods were transported over there.

Are Goguryeo people stupid?

Qin Hao thinks it's quite normal, he caught up with the big era in his last life, and the RMB and foreign exchange coupons can even reach one to four when they are the craziest, and the result is... saved trillions of foreign exchange in the United States.

Qin Hao's methods are similar to this, but the difference is that we had the renminbi at that time, and Goguryeo at this time。。。。。

Three months later, Pei Xingjian swore that as long as the Tang Dynasty announced the cessation of trade with Goguryeo, Goguryeo would be in chaos for at least a year, and even if the luck was particularly good, not a single soldier would be sent, and Goguryeo would collapse.

It made Li Shimin a little embarrassed, it was too easy to make this special money, and even he didn't want to fight Goguryeo.

At this point, even the people of insight in Goguryeo saw that the problem was wrong, and it only took a few months for Datang to kill them, and now they are facing only two ways, either continue to trade with Datang and continue to let Datang hollow out their foundation, which is tantamount to drinking water to quench their thirst.

The other way, of course, is to give up trade with Datang, which is equivalent to a strong man's broken wrist, the disadvantage is that there will inevitably be chaos internally for a while, although because the trade with Datang is not long, it will not be chaotic for too long, but in case Datang takes this opportunity to use this as an excuse to make trouble, it is difficult to say that it will not cause a chain reaction.

The king of Goguryeo was still Gao Jianwu at this time, and he was also a very strategic emperor, he gritted his teeth and broke it with a ruthless heart! It's better to mess around for a while now than to be toyed with by Datang in the future.

At the same time, additional manpower was sent to build the Great Wall, and another fleet was sent to Chang'an to pay tribute, express sincere blessings to the Heavenly Khan, and return the former Sui Jingguan.

Li Shimin is angry now, who is playing soft and hard with the two of them, showing that you have political skills, fight! Must fight! Take it back, and I'll take it myself!