After coming out of Yuan Tiangang, Zhang Nan left the Ministry of Tiangong, and the harvest of this trip can be said to be quite rich, not only knowing that the Ministry of Tiangong now has a semi-industrial level, but also seeing that Yuan Tiangang and Li Chunfeng have developed Datang Chemical well, at least the two of them are now able to make some simple chemicals for production.

Knowing these things, Zhang Nan felt a burst of relief, at least Datang's scientific and technological development has been carried out according to his wishes.

After the morning of the next day, Zhang Nan was summoned to the imperial study by Comrade Li Er, although Comrade Li Er is now in a semi-retired state, but this imperial study is still the exclusive property of Comrade Li Er, and Li Chengqian is not qualified to sit here.

Looking at Comrade Li Er, who was sitting on the chair with one foot on the chair, leaning on the back of the chair, swiping the circle of friends with his mobile phone in one hand, and holding a purple sand teapot with the other, Zhang Nan felt a sense of disillusionment.

Is this really Comrade Li Er, the first emperor of the ages? How do you look at it now, how do you look like a middle-aged greasy uncle.

"Qingquan, how about the Heavenly Ministry come in." Li Er said without raising his head while looking at his phone.

"It's good, now the Ministry of Tiangong is already developing new weapons, as long as they are developed, there will be no opponents around my Datang." Zhang Nan said.

In fact, the current Datang is already invincible, but as long as the shotgun is replaced and the troops are equipped with hot weapons, it will definitely be even more invincible.

"Eh, Qingquan, don't take your vision so short, I'm not very worried about the Tang Dynasty now, but now the trouble in my heart is still the country far away in the sky." As soon as Li Eryi heard Zhang Nan say such words as an invincible opponent, he was immediately a little unhappy.

After all, for Li Er, he still lost a little bit by going to sea this time, and he also knew a country that was not weaker than Datang. This has made Li Er distressed for a long time, although Li Er has never told this distress to outsiders, even his closest eldest grandson, the Empress, but every time he can't sleep at night, Li Er's head is thinking about this country.

"The emperor doesn't have to worry, we won't go to war with this country for a while, so we just need to vigorously develop our science and technology, and when our technology crushes them, who wants to live or who dies, isn't it a matter of our words?" Zhang Nan said.

"Having said that, but you also know that the development of this technology is not easy to talk about, although I am not good at this, but I also know that this thing is not so easy, I am just afraid that time will not wait." Li Er put the mobile phone in his hand on the table, and then his fingers tapped rhythmically.

When Zhang Nan heard this, he thought to himself that this is not easy? So he said: "Your Majesty, if you want to develop science and technology quickly and simply." ”

"Simple? How can this be simple? Li Er looked confused.

"Of course, it's simple, there is only one word for science and technology, "money", as long as the money is in place, everything is a trivial matter. Of course, Zhang Nan's words are not unreasonable nonsense, this thing is obvious.

The world policeman of later generations, among all the national expenditures, his scientific research expenditure will always be the first, although I don't want to admit it, but I have to admit that this world policeman does master 80% or even more of the world's top technology.

This is not only because they have a relatively complete scientific system and talent training, but also because of money, after all, the country's affairs, in the end, are still smashed on a piece of money.

"Money? Do I give less money to the Ministry of Heavenly Works? I think it's a lot, although I know that this thing is really expensive, but Datang doesn't mean that you can take it out. Li Er also rubbed his temples and said.

Although the current Datang seems to be in a state of being rich, it is actually just superficially rich.

Although Datang won two pieces of land through the war, at least until now, these two pieces of land still did not bring any substantial benefits to Datang. On the contrary, Datang has been sticking money to these two places.

In that Turkic place, the taxes are pitifully small and almost negligible, and who can expect how much this group of people who gallop on horses on the steppe for a day will be able to take out how much they can pay?

And the land of Goguryeo, because the Tang Dynasty implemented a flat push policy when it fought Goguryeo, that is, it bombarded with thunder, and then the infantry cleared the city. Although this was highly efficient, recovery from the war was very difficult.

Not only has not a penny been taken out of that place in the past two years, but the treasury of Datang has been allocating money to ensure the post-war recovery there, and in order to show his benevolence and appease the people, Comrade Li Er also waives his hand from paying taxes there for five years and allows them to recuperate.

Therefore, such a large piece of land in Goguryeo has always been raised by the treasury of the Tang Dynasty.

Not to mention that because of the development of science and technology, Datang is engaged in infrastructure construction throughout the country, and because the labor force is relatively abundant, all state capitals in Datang are frantically building roads and leveling mountains, trying to connect the entire territory of Datang. Moreover, there are also large projects such as water conservancy, and it can be said that the expenditure on this infrastructure has taken 60% of Datang's budget.

Although this is inevitable, when the whole country is going on at the same time, the treasury is relatively weak. Fortunately, there are Zhang Nan's racecourse, other industries, and Datang's official trade to support it, otherwise Datang is definitely a fiscal deficit now, and it will be so big that Cui Shao's entire household department has lost his official position.

Now Zhang Nan said that scientific and technological research and development needs to throw a lot of money, Li Er is also a little powerless, although Li Er wants to throw a lot of money, but helplessly, the treasury does not allow Comrade Li Er to do this.

"Your Majesty, our trade is still not good, the farther our Datang things are pulled, the more valuable they are, but our current caravan has not earned the money we want." Zhang Nan said.

"I know, it's just that this is a long way, and the safety of the caravan is a big problem, not to mention that just collecting taxes from these caravans can't directly support our Datang." Li Er also frowned.

"Then did the emperor think about creating a national caravan? In this way, the profits obtained are also more objective, and we have more room to operate. Zhang Nan said.

"I've thought about it, but now there are few rich people around Datang, even if I trade with distant countries, it won't quench my thirst, and it will take at least a few years to get the real money back." Li Erdao.