When Lu Zhou arrived in Lecture Hall 1, the report meeting had already begun.

Standing in front of the PPT showing the curtain, an old man with white hair pushed the glasses on the bridge of his nose, and was talking in an unhurried voice about something that Lu Zhou couldn't understand at all.

However, although he didn't understand it at all, the scholars in the audience listened very carefully, and even fascinated.

This reminded Lu Zhou of his own report meeting, whenever he was holding a report meeting, the audience was basically in this state with this look.

He's a master.

Thinking so in his heart, Lu Zhou didn't stay at the door for long, and quickly found a vacant seat in the last row and sat down.

In fact, the doctor's name was an exaggeration, and although there were indeed many people in the lecture hall, it was not so much that you had to sit in the hallway without finding a single spot.

And the few people who sat on the floor under the podium were basically wearing thick glasses, and they looked very, very young. This kind of person comes to the lecture with a question or a purpose, and basically sits there, whether there is a seat in the lecture hall or not.

After finding a place, Lu Zhou, who sat down, stretched his neck and looked around, then flipped out his mobile phone, and while finding the review of the paper he had collaborated with Xiaotong before, he devoted part of his energy to listening to two sentences of Professor Joseph's explanation.

The Lu-Bewley model part of the theory, he has largely forgotten. Although this thing seems to be a bit important to the economics profession, for himself, it is a gadget that he made casually, so he does not put it on his mind at all.

But now that he took out the paper and reviewed it again, he quickly picked up the core content of the paper, that is, the part of the mathematical model.

For ordinary people, this kind of dual-minded way is most likely to be unflattering at both ends, and they don't care about either side.

But for Lu Zhou, who often does this to save time, he is almost getting used to it.

I still remember when I was a professor at Princeton, not only did he use two things, but he could even do three things, asking questions when he was listening.

Standing on the stage and speaking slowly, Professor Joseph, who saw a touch of light from the back row of the podium, suddenly frowned.

The glow from the screen of the phone is not noticeable, and it can even be said that if you don't stare there, you won't necessarily notice it.

However, in the lecture hall where everyone was staring at him meticulously and expecting him to continue, a person kept burying his head in the mobile phone screen and swiping small movements, even if he was far away, even if he was sitting in the last row, it was so conspicuous in his perspective.

While it's not uncommon to play with his phone at presentations, he has always resented the behavior, which gives him the impression that his research isn't as attractive as his phone.

However, Joseph only frowned, and then ignored the person who made him unhappy.

If this was in his class, he would definitely ask the person who was playing with his phone to go out, but this was an academic presentation, and he couldn't delay the time of other scholars because of this little thing, and there was no such thing as a credit as a threat......

At this moment, Lu Zhou didn't notice that he was hated by a certain economics bull because of this inconspicuous action.

But if he knew the reason, he would definitely laugh and cry at the old gentleman's eyesight.

What's more, speaking with his conscience, he is not playing with his mobile phone, but reviewing the previous article!

However, even if he knew about it, Lu Zhou probably wouldn't take it too seriously.

First, he is not a scholar in the field of economics, and second, at his current level, there are not 1,000 but 800 people who are thinking about him, and there are not so many or two at all......

Read the paper from beginning to end, both in the mathematical model and the theoretical part.

After reading it, Lu Zhou put away his mobile phone, and was about to listen with great interest how Professor Joseph evaluated his mathematical model, but he didn't expect that he had just focused on the stage, but the old gentleman's next sentence almost made him vomit blood.

"As we all know, a fairly novel mathematical model was recently born in the field of economics, and its creator is the well-known Fields Medal winner Professor Lu Zhou, which has saved a lot of tedious calculations and made the results ......of the model more accurate by improving on the basis of the classic Bewley model."

"I don't deny that this mathematical model is beautiful, folks, I don't deny it."

Glancing around the lecture hall, Professor Joseph continued in a serious tone, "Although I myself am a supporter of new economic and trade theories, and often use mathematics as an auxiliary tool to assist my quantitative research on economic theories, I must emphasize again that mathematics is only an auxiliary tool in economics, as if we are a 'macroeconomic forum' rather than an 'accounting and finance forum'. ”

Friendly laughter rang out in the room.

For this joke made by the old gentleman, many people still agree with it.

Indeed, today's new economists are becoming more and more dependent on computers and mathematical tools, and even Nobel economics is becoming more and more likely to become the "Nobel Prize in Mathematics".

In the eyes of conservative academics, this is simply too stupid.

After a pause, Professor Joseph continued.

"The significance of economics is to study the laws of human economic activities, that is, the laws of value creation, transformation, and realization, rather than a number game. We're economists, and we're not financial accountants. ”

"Although the theme of this presentation is the Lu-Bewley model, what I am going to talk about next may disappoint many people," said Professor Krugman, who was sitting in the front seat with a few seconds of his gaze on the fellow Nobel laureate who strongly admired the Lu-Bewley model. ”

"In my opinion, these shortcomings are fatal!"

The moment the words fell, whispers suddenly rang out in the lecture hall.

In response to Professor Joseph's criticism, although Lu Zhou almost didn't vomit blood at first, after hearing what he said later, his expression returned to normal.

He was a mathematician himself, a complete layman in the field of economics, and even if there were fatal flaws, it would be understandable.

Moreover, Professor Joseph only criticized the economic value of his Lu-Bewley model, and did not say that his mathematical theory was problematic.

Lu Zhou didn't care about this at all.

Let him go.

Just as he leaned back into his chair, he heard two young-looking scholars sitting next to him, like Ph.D. students, whispering to each other.

"Didn't Professor Krugman discuss the Lu-Bewley model in his new paper? It seems that his attitude is the opposite of that of Professor Joseph? ”

"Needless to say! Professor Krugman and Professor Nash have always had a good relationship! He is a proponent of mathematical economics. His most classic view is that a beautiful economic model must have a mathematical sense of beauty...... However, he himself seems to have very average math ability. ”

"This presentation seems to be a bit interesting."

"Yes, yes, Professor Krugman is there! Professor Joseph's words may have been addressed to him...... A response to his paper some time ago! ”

"It's a pity that compared to Professor Joseph, Professor Krugman's coffee position is still a little lower! Even Samuelson, the author of "Economics", said that he was ashamed! ”

Listening to the whispered exchange of these people, Lu Zhou's eyebrows slightly raised upward.

Professor Krugman is also in the lecture hall?

These words were spoken specifically to him by Joseph?

Although I don't understand the debates in the economics profession, I always feel that things are gradually getting interesting......

Sitting in the lecture hall, Professor Krugman's expression was a little stiff.

Professor Joseph's words were undoubtedly a slap in the face.

A little breathless, Xiao Tong finally couldn't help but whisper, "Professor, Lu-Bewley model...... Is there really a flaw? ”

"It's hard to say," Professor Krugman shook his head, "I don't think there's anything flawed...... But Joseph, an old fellow, has a better mathematical model of economics than I do, and maybe he has discovered something that I haven't discovered. ”

Professor Andes also nodded, agreeing with his old friend Professor Krugman.

"I'll have to hear it again, maybe it's not that bad."

Professor Krugman's expression was solemn.

"yes, I'll have to hear it again."

Professor Joseph on the stage continued to speak, while using the marker pen in his hand to write the key points of the lecture on the whiteboard from time to time.

"As we all know, the Bewley model has gradually become the mainstream method of macroeconomic research because it overcomes the inherent shortcomings of the stochastic dynamic general equilibrium framework, and the Lu-Bewley model has been improved on this basis, such as using many mathematical tools such as the 'endogenous grid method' to replace the Lagrange multiplier method to solve each step of the optimization process......"

"However, it also deprives the Bewley model of its original rigor."

【f（x，y，z）=ag3，1+bg3，2+cg3，3…… where x,y,z≥0......]

【……】

As his explanation continued, the equations were printed on the whiteboard.

Stopping the marker in his hand, Professor Joseph looked back at the lecture hall and continued.

"If the KPR utility function is introduced into equation 3 for testing, the problems in the model can be clearly found."

"As I said earlier, the Lu-Bewley model is fatally flawed in theory and needs to be significantly modified at the very least."

"My story is over, and if you have any doubts, you can raise them."

The venue was silently quiet.

It was as if a needle could be heard when it fell on the ground.

As he said this, Professor Joseph glanced in the direction of Professor Krugman, and when he saw that he was looking at the blackboard with a confused expression, he couldn't help but pull the corners of his mouth slightly.

Judgment from above.

This guy didn't even keep up with his explanations.

Although he didn't intend to compare himself to this guy in the first place, he was just quite unhappy with this guy's argument that he admired the Lu-Bewley model.

I thought this guy could tell something, but I didn't expect to be able to ask a question.

Thinking of this, a faint disappointment appeared on Joseph's face, as well as a trace of the loneliness of a master.

Not a single one can fight!

Just as he was stacking papers on the lectern with his papers, ready to wait a little longer for no one to raise his hand, so as not to waste time, a hand that surprised him was raised from the back row.

"I have a question for me."

As the sound came from the back row of the lecture hall, the huge lecture hall was instantly lively......