In the outer study, Lin Yu was soon left alone.

He needed a place to think, quietly. And Jia Jiu's outer study is a rare quiet place.

After returning to his room and changing his clothes, Jia Jiu sat down again, and when he was about to pick up the pen, he heard Qingwen say: "Girl, what you told Uncle Lin should be fooling him, right?" ”

Jia Jiu raised his eyes and glanced at him, "Am I such a person?" If that's a lie, why should I tell a big lie? ”

Qingwen rolled her eyes and didn't speak, but Xiaohong, uneasy, and didn't even know that the ink ingot in her hand had fallen off.

Obviously, as Lin Zhixiao's daughter, Xiaohong, who has seen the world, has a sensitivity to certain things that Qingwen can't catch up with.

Xiaohong frightened herself.

He knew that if these words were true, then what his girl had in her hands and in her hands would definitely be able to cause great changes in this world.

When Jia Jiu picked up the ink ingot and handed it to Xiaohong, Xiaohong reacted: "Girl, everything you said is true?" ”

Jia Jiu put away the smile on his face, looked at Xiaohong calmly, and said, "Yes, everything I just said is true." ”

Xiaohong suddenly knelt down and said, "Girl, the maid boldly pleads with the girl." This matter is a matter of importance, and I ask the girl to think twice. If you can, please ask the girl to say hello to the palace......"

Jia Jiu shook his head and said, "Actually, the last thing I want now is to say hello to the palace." ”

"Girl!"

"Junjun!"

Xiaohong and the four aunts were stunned.

Jia Jiu replied: "When I was a child, I grew up under the upbringing of an old lady and my father. I always think that whether it is the emperor or today, they are all Ming Jun. But after all these years, I also frequented the court. Observe the world with your own eyes and heart, and pay attention to the things of the emperor today. In my opinion, the Emperor Taishang may have been a Ming monarch in the past, but he is already old, and now he is just an old man who calculates even his own son for the power in his hands. As for today, maybe he's a good guy, it's a pity. If he wants to be a wise man, he still lacks something. Now tell the palace about this salt fertilizer, this set of processes. In the end, it will only become a victim of two generations of kings competing for power and profit, and it will not benefit the people at all. ”

Although it is very contradictory, what Jia Jiu said is also true.

Certain words can only be said to certain people. Same words. Some people will believe it. Some people won't believe it.

Jia Jiu was sure that the children of the Lin family would believe their words, because they were all human beings in two lives. Lin Daiyu may not believe his words 100%, but he is naturally kind-hearted, and he will not mind using a little money to confirm whether the salt and fertilizer process is true or false. After confirming the authenticity, Lin Daiyu would not mind spending a little more money to expand the salt fertilizer workshop. Let your own land use salt fertilizer.

The Lin family is also a family that has been inherited for a hundred years, even if the land in their hands is not as good as those thousand-year-old families. But it's also very impressive. If Lin Daiyu wants to use salt fertilizer on all her land, she will definitely need a lot of it.

Thinking of this, Jia Jiu was shocked.

Another thing that comes to mind, and that is soybeans.

Soybean crops, both soybeans and black beans, have a very strong nitrogen-fixing effect. Even if they are reluctant to ferment the land with beans, they often grow soybeans and add fermented and sandy farm fertilizer. This is the method that the people have used for thousands of years to raise the land on the land of the Central Plains. Although the price is not enough to support the production of double cropping rice, it is very cost-effective for the people. After all, they had an extra season of beans.

Jia Jiu immediately sat on the kang, took a new piece of paper, and wrote four words on it, marginal cost.

While growing soybeans and using farmyard fertilizer is cheap, the real marginal cost is time.

It takes time for plants to grow.

The restriction of salt fertilizer, that is, the fertilizer industry, is the level of technology and the scale of process.

Jia Jiu quickly wrote down lines of numbers on the paper and calculated. The type and quantity of salt fertilizer needed to grow double-cropping rice, to the related industry, and finally to the total amount and time required to establish the relevant industry.

In another world, although the retail price of a pound of salt is only a piece of zero, which is equivalent to this side, it is only two copper plates. But in this world, a pound of salt and a tael of silver is already a conscience price.

The gap in the middle is the chemical industry chain established by the country with countless efforts, countless talents and countless money and grain.

An hour later, Jia Jiu finally came up with the number he wanted. But after he took a look, he put it on the candle and burned it, and the paper ashes were also put in the basin, and let the girls take it and pour it.

It seems that it is useless to rely on your own three-inch incorruptible tongue. It's time for the children of the Lin family to know the marginal cost theory.

I believe that the people of the Lin family will be interested in a new knowledge. Although the most applicable place for such knowledge is not agriculture, but industry.

Jia Jiu's heart moved, and he immediately had an idea.

He wrote down "Capital" on the paper, three words, thought about it, wrote "The Wealth of Nations", then exchanged the corresponding books, and copied them quickly.

Of course, the original works of these two books cannot be applied to this world, nor can they be applied to Daqi. Jia Jiu also has to sort it out by himself, delete some of the big perverse theories, and then change the name and angle to re-explore a certain issue, and also provide corresponding cases.

Jia Jiu was very busy, and he didn't even have time to regret that he was a woman.

If he is a man, even if he does not participate in the imperial examination and does not become an official, he can take care of the family business himself, and verify his theory in practice, and even train students, or learn from countless predecessors, establish academies, lay countless cornerstones for this theory, and find ways to carry forward this set of theories.

It's a pity that he is a girl, and due to the limitations of the world, he can only contact a limited number of people around him, and then choose the right person from among them......

Jia Jiu knows very well: these materials and books in his hands seem to be very junior, but they lack a foundation and a sufficient hotbed. Jia Jiu didn't know how far these things could go in this world. But he still hopes that he can leave something in this world.

A spark can start a prairie fire.

Jia Jiu can only believe Jia Yu's words now: Don't underestimate the magic of time. (To be continued......)