Regarding weights and measures, the Han court had its own set of formed and mature systems, which did not require Guo Bin to worry too much, nor could he worry about it. However, in order to improve the accuracy of machinery manufacturing, Guo Bin still re-established the ruler according to the length unit of later generations, within the scope of his influence.

This kind of ruler that redefines the unit of length was handed down from Fulong Villa and was first used in Yangzhai Construction Co., Ltd. As a result, the buildings of Yangzhai Construction Co., Ltd. appear more accurate and exquisite because of their precise dimensions. Later, the sewing machine developed by Ma Jun was also measured in the unit of length in the Fulong Villa School, and with Yang Zhai clothing, the cutting of its fabric was also accurate to the millimeter. Therefore, more accurate length measurement units have gradually spread to all parts of the country along with the high-quality products of Fulong Villa.

It is conceivable that with a more accurate unit of measurement, Yangzhai County will develop more "precision instruments" and more cutting-edge products.

In addition, the trading houses in the three cities outside the Saiwai City, most of the storefronts displayed in the trading houses are samples of shops, and those who come to discuss business are also big deals of tens of millions of dollars. In today's understandable terms, the trading banks are all wholesalers.

Some of these wholesalers are from the Central Plains, and they transport the goods from the Central Plains to the outside of the Saiwai, and then bring samples of the goods to the trading houses to sell to customers. Others come from the grasslands, and most of them are cronies of the leaders of a certain tribe in the grasslands, bringing the wool, cheese, butter and other industrial raw materials and manufactured products produced on the grasslands, and selling them to merchants from the Central Plains at their own rented booths.

Whether they are from outside the city or from the Central Plains, most wholesalers have one thing in common, that is, they have a store in the trading house, and at the same time, they rent warehouses in the city to store their goods. And the owners of these warehouses are naturally the wealthy families in Yingchuan County.

Through this method, it took about half a year for the Yingchuan wealthy family to recover nearly a quarter of their investment, which made them all happy and have a deeper understanding of Guo Bin's profound and long-term economic vision.

Because most of the transactions in the city are wholesale transactions, and the amount of money involved is very large, here, a very inconspicuous small shop, the daily transaction volume may reach hundreds or even nearly 10 million yuan. In view of the language barrier between the Han and Xianbei people, and in order to ensure the fairness of the transaction, the transaction contracts in the three cities are not only in Chinese, but also different from other places, and are carried out in a very special self-created transaction mode.

In fact, it is also simple to say, when the two parties conduct a transaction, they must be officially certified by the three cities outside the Saiwai.

Because it is the first time that the Xianbei people and the Central Plains people have carried out such a large-scale transaction, both sides are not very supportive. In the minds of the Xianbei people, the Han people are cunning and wise, and they are often deceived by the Han people, which causes the Xianbei people to distrust the Han people.

In addition, the Han trading teams that trafficked silk, tea and other materials from the Central Plains and came to the outside of the Saiwai after many dangers and obstacles were naturally at a disadvantage when they left the Great Wall and entered the Saiwai Fortress and stayed away from their own country. Therefore, they are more desperate to be strongly guaranteed on issues such as personal safety and transaction equality. The Three Cities outside the Saiwai were originally Guo Bin's private villages, and the merchants of the Central Plains would naturally gather around the officials of the Three Cities outside the Saiwai to seek refuge.

Therefore, when both sides of the trade were in extreme need, the three cities outside the Saiwai, which played the role of peacemakers and intermediaries, rightly reached into the trade between the two sides. This kind of intervention is nothing more than a witness to the large transaction between the two parties, so as to avoid unfair transactions caused by language barriers or various other reasons.

In the event that both parties are sure to make a transaction, they will come and apply to the staff stationed at the trading house, and the staff will be involved in the trade between the two parties throughout the process, acting as an intermediary. When both parties go to each other's storage area to inspect the goods, the staff will also participate in the signing of the trade contract between the two parties, and only the trade contract signed and sealed by the official staff of the trading bank can really have legal effect.

Of course, this service is not free, and both parties to the transaction have to submit a 15% trade tax to the trading bank. The 15 percent trade tax was divided between the imperial court and the trading houses, with the imperial court receiving 10 percent and the trading houses receiving 5 percent.

In the trading banks of the three cities, all private transactions are prohibited, and this kind of tax evasion is not officially recognized and protected by the trading bank, and the trading bank will not bear any responsibility in case of accidents. Once this behavior is discovered, they will be expelled forever and will not be allowed to enter the three cities again to trade.

Because most of the trade caravans in the Central Plains are rich families, and these caravans can come to the three cities outside the Saiwai to trade, all of them have negotiated with Fulong Villa many times, if they have a bad relationship with Guo Bin or even lose the opportunity to trade outside the Saiwai because of a little petty profit, it is undoubtedly an extremely stupid behavior.

Needless to say, the Xianbei people are not smart enough to avoid trade taxes and privately contact the Central Plains wealthy clans, and they are not familiar with the Central Plains wealthy clans! The way of trading through the official intermediary of the trading bank is undoubtedly the most physically and mentally labor-saving, safe and high-quality method.

In addition, in order to improve the convenience of transactions, "vouchers" similar to later banknotes have appeared in the trading houses.

Because in the trading house, most of the two parties to the transaction were the Central Plains caravan and the Xianbei tribe, and the Han court also restricted the flow of iron money into the outside of the Saiwai, so the transaction between the two sides was basically barter. However, the reason why this barter method of trading has been swept into the dust under the rolling wheels of history is because of its backwardness: this barter method of trading is simply too inconvenient.

To give a simple example: a jar and a half of heroic blood produced in Fulong Villa can be exchanged for a high-quality war horse, and when it is time to trade, if you want to exchange a war horse, you only need to bring a jar of hero blood, and then pour out half of the other jar. In addition, three live sheep can be exchanged for two military uniforms made from Yang Zhai clothing, but if you only need one, you will have to choose between giving up the trade and splitting the sheep in the middle. Therefore, this restricts the freedom of trade and causes great inconvenience to the trade between the two sides.

Although this inconvenience is almost negligible in the transaction of large quantities of goods, the inability to trade the five-baht coins made by the Han court as currency has led to a resurgence of the problem.

For example, a tribe that walked on the steppe for days and nights came to the trading house to trade. They rented a warehouse to store their goods, and they also rented a storefront in the trading house, and the deal went smoothly, and the two sides completed the deal at a very satisfactory price, and the other party exchanged a hundred jars of hero's blood for their five hundred barrels of cheese and all the butter.

However, they carried a total of 550 barrels of cheese, and the remaining 50 barrels after the transaction were clearly not suitable for renting warehouses and storefronts. However, in the trading houses where there is a lot of trade in large quantities, there is little room for such a small trade, and it would be foolish to bring back such goods, which are not of great value in their hands. Of course, this embarrassing situation occurred not only among the Xianbei tribes, but also in the Han trade caravans.

To solve their troubles, the trading house has humanly introduced something called a voucher. This voucher is a voucher for merchants to sell their surplus products to the trading house, and after they "process" the surplus goods to the trading house, the goods will be transported to the trading house's own warehouse, and they will be given a voucher of value in units of five baht.

The voucher indicates how much it is worth and then in duplicate, and the merchants take one as the voucher and one in the trading line as the base. This kind of voucher can be exchanged for commodities at any time, and it has a similar value of currency as a guarantee for strong materials such as fine wine, soap, and high-end ready-to-wear clothing of Yang Zhai Clothing.

As a result, they no longer have to pay the rent of warehouses and storefronts, and can buy their favorite products in the storefronts operated by the trading houses themselves. Or bring them back to the tribe, and when they have accumulated a lot, they can be exchanged for large quantities of goods and materials at once. Of course, the Xianbei people basically bought the goods from the Central Plains transported by the merchants of the Han Dynasty sold in the trading houses, while the Central Plains merchants bought the opposite.

In this way, the trading house can use a worthless piece of paper to buy the surplus goods in the hands of the merchants, and at the same time change hands, and then sell these goods at a high price, and the money earned inside and outside is naturally not enough for outsiders.

It is through the collection of taxes and the issuance of vouchers that the trading house has become one of the biggest gold-absorbing monsters under Guo Bin, and its profits are now almost comparable to the heroic blood produced by Fulong Villa. Otherwise, the most profitable business is not to open a company, but to build your own country and collect taxes!

In addition, in the three cities outside the Saiwai, whether it is the city wall, the residence, or the warehouse, or the trading house, or the yamen, it is all built by Yangzhai Construction Co., Ltd. The central city is still good, and most of the two satellite cities are residential buildings, and the architectural style they adopt is the style commonly used in Fulong Villa and even Xicheng District of Yangzhai County.

Most of these residential areas have Dilong, which provides great convenience for the residents of the three cities outside the Saiwai to spend the winter safely and comfortably, and at the same time, it also prevents many people from freezing to death in the harsh winter outside the Saiwai. The brick and stone structure of the building, on the basis of better thermal insulation performance, also avoids the danger of fire caused by wooden houses, giving people a great sense of security.

Yangzhai Construction Co., Ltd., a huge construction giant, has not only done business all over the country in about a year since its establishment, but also cultivated a large number of excellent designers, technicians and skilled workers. There is no doubt that the construction project of such a huge scale of the three cities outside the Saiwai has greatly improved the brand effect of Yangzhai Construction Co., Ltd.

It is precisely because this company has such rich experience in the construction of masonry buildings that when Guo Bin proposed that they build the South Palace, Fang did not encounter opposition from the ministers of the DPRK and China.