## 5 Discussion
### Practical Delivery Restrictions  
The actual ad delivery system may have more issues that must be dealt with. For example, properly sorting the order of advertisements and digesting the amount of advertisements to be executed is a common problem. In addition to trying to improve the accuracy of advertising, the advertising system must also digest the amount of advertising to be executed. Different advertisers may want to advertise to audiences at a specific time and location. Generally speaking, they can (on average) digest the budget of each advertiser through random exposure. However, if there is a huge disparity in the budget size between advertisers, then the implementation of average exposure may cause additional problems.  
For example, if ad placement is executed by average placement, then after a while, ad exposures with a smaller budget will be run out first. After that, all of the advertising volume may expose to the advertising with the largest budget. Of course, this situation is not abnormal for the advertising delivery system, but it is easy to cause dissatisfaction among the exposed audience. At this time, the audience is very likely to lose interest in the advertisement because of the repeated appearance of the ad and they may even become dissatisfied. The result may be a decline in the click-through rate of ads, and continuous waste of ad exposure resources. Unlike general advertisements, there are many opportunities for exposure. Because the number of audiences that appear at a specific time and location is limited, the use of exposure must be managed more effectively.  
Bidding can be used to deal with the priority of exposure. However, simply using the general bidding system cannot avoid the above problems. Once a large advertising budget enters the system's exposure schedule, its funding will take up a lot of exposure. If you want to suppress the above problems, you must adopt a staged bidding pricing strategy. That is, in addition to the general single-exposure bidding, you must also make an additional bid budget plus requirements for the total amount of exposure to avoid the dilemma of resources being monopolized by advertisers with large budgets.  
If you want to make such an evaluation mechanism, the first thing you need to know is the upper limit of the total amount of exposure. It is necessary to obtain the total amount of exposure before the reasonable value of the additional bid budget plus can be estimated. By accumulating data and establishing predictive models, we can more clearly know the required advertising exposure quota and the available advertising exposure quota and make more advanced exposure management strategies based on these quotas.  
For example, if there are multiple advertisers today, and several of them account for the majority of the total exposure available, then their exposure weight and bidding price should be adjusted according to their different proportions. Of course, such adjustments will not be known to advertisers. For advertisers, it is just a bidding number, and if the quotas of advertisements are not exposed enough, from the advertiser's point of view, it is only because the bidding price is not high enough.  
What the system needs to deal with is to determine a relatively reasonable bidding price evaluation mechanism so that advertisements with a large amount of exposure can be exposed according to the premium price. Because the specific design of this part is more complicated and has deviated from the subject of this research, it is not within the scope of this research. Here, we will only outline possible problems and solutions.