"Qingquan, I've been making a lot of money lately." Comrade Li Er sat in the imperial study, picked up his purple clay pot and smashed it with a sip of tea and said.

"How can you, Your Majesty, what you said is just barely making ends meet."

As long as Zhang Nan hears Li Er talking to him about money now, he must cheer up his spirit, and the lessons of history tell Zhang Nan that as long as Li Er talks about money, it is very likely that he will take a fancy to his industry.

Li Er will not be polite to him, generally Li Er does not want money, and he comes up directly to ask for shares and dividends, which is no different from cutting meat directly, so Zhang Nan also has the spirit of twelve points.

"Hmph, look at the way you buckle the rope, I don't want you."

Li Er saw Zhang Nan's indescribable expression, and said with a dark face.

"You don't want to, you're robbing." Zhang Nan complained silently in his heart.

"Okay, your clothes, I don't have this idea, after all, Lizhi also has shares in it, ask you for it, it's no different from taking Lizhi." Li Erdao.

"You know." Zhang Nan said silently.

"I called you over today, there is nothing else, recently there have been more foreign businessmen in Chang'an City, there are many countries with bad intentions, vainly trying to cover up their spies with the identity of businessmen, hoping to steal technology from our Datang, recently the Criminal Department has investigated and dealt with many such cases."

When Li Er said this, he couldn't help but rub his temples. It can be seen that Comrade Li Er has been worried about this matter for a long time.

This kind of thing is really difficult to do, you can only find one and check one, and there is no other way.

After all, they entered Datang as businessmen, and Datang can drive away spies, but they can't help but do business, Li Er will definitely not be able to do such a stupid national policy of closing the country and closing the country.

"Your Majesty, do you want me to find a way to solve this problem?" Zhang Nan asked.

"Isn't this nonsense, otherwise what else would I have asked you to come here for?"

“……”

"Then Your Majesty, do you want to solve the problem of spies, or solve the problem of foreigners?" Zhang Nan continued to ask.

"Is there any difference between these two?" Li Er wondered.

"Of course there are differences, and there are different solutions for different things." Zhang Nan said.

"So what if I want to solve the problem of spies?"

"It's easy to do, find out which country it is, just send troops to fight it directly, how about the emperor, this method is simple and rude, and easy to implement." Zhang Nan said with a smile.

"Fart, fighting, that's just fighting? Besides, I've fought so much now, and I still have to manage it well, do you think it's over just by beating it down? ”

After listening to Zhang Nan's unreliable method, Li Er also complained.

But Li Er didn't say that there was anything wrong with Zhang Nan's method, it just didn't apply to the current Tang Dynasty.

In the past, Datang was, you came to bully me, reached out to take my things, I resisted if I could, and if I couldn't resist, I could only give it to you.

The current Datang is different, the current Datang is, if you dare to reach out and take my things, I will not only cut off your hand, but also cut off your head.

Dare to do this, naturally because you have the strength to do so.

"That's to solve the problem of foreigners, it's simpler, the emperor only needs to give them a visa for these foreigners who come to my Datang." Zhang Nan said.

"Visa? What's that? Li Er wondered.

"The so-called visa is the identity certificate of those foreigners in Datang, without this thing, these foreigners are prohibited from entering, and they will be repatriated to their own country by my Datang." Zhang Nan said.

"But does this work? This alone can solve these people's problems? Li Er obviously didn't believe that the visa in Zhang Nan's mouth had such a big effect.

"That's quite useful, your Majesty, don't think that this visa is permanent, generally speaking, the visa validity period cannot exceed six months at most, after all, most of the foreigners who come to my Datang are doing business, how can any business be done for six months?" Even if there is, then we can consider increasing the duration at our discretion, but he must also provide valid supporting materials. ”

"Well, you go on." Hearing this, Li Ercai felt that Zhang Nan's so-called visa was a bit interesting.

"To put it simply, it is to tell these foreigners that it is not easy to enter the territory of our Datang, and all foreigners must obtain a visa issued by our Datang official before entering the country. And the application for this visa can only be applied for at the border state of our Datang, and the application can only be entered if the application is approved. ”

"But there's still room for manipulation." Li Er frowned.

"Of course, this is just a preliminary trial, foreigners who enter the Tang Dynasty basically come to Chang'an City, so if they enter Chang'an City, wouldn't it be good for us to give them a review? And it is more rigorous than the first trial. ”

"All foreigners entering Chang'an City must provide supporting materials, and all information about his birth, age, asset status, business status, length of stay, etc., must be strictly examined, and it is best to ask about his ancestors for 18 generations." Zhang Nan said with a smile.

"But does it really work?" Li Erdao.

"Naturally it is useful, the emperor may not know how difficult it is to speak in the place where the visa is handled, the minister suggested that the place where the visa is handled should be handed over to the Ministry of War, and it is those departments that specialize in intelligence work, after all, if it is really a spy, then everyone is professional, and the possibility of finding it will be a little greater, even if it can't be determined for a while, we can also grasp the first-hand list, and then arrange people to keep an eye on it."

"And the visa office has a veto power, saying that if you don't let you in, you won't let you in, who do you love, after all, we Datang are the boss. If even our intelligence department can deceive them, it means that they do have two brushes, then we can only limit them from the time, and if we want to get the core technology of our Datang now, let alone one year, it is three years, I think it will be difficult for them to penetrate into the Ministry of Heavenly Engineering, as for our other technologies, then we can only let the emperor strengthen control, this is the best way that the minister can think of. ”

After listening to Zhang Nan's words, Li Er thought about it, and after a long time, Li Er said: "It's indeed a way, then let's do it first, but the candidates for the visa office are still here, and there is no need for the military department, but I will pick people out, Qingquan, you still have to teach them something." ”

"This is simple, the minister promises, let alone spies, even ordinary foreigners want to enter the country, and the minister will let them waste all their strength." Zhang Nan said with a smile.