# Two-Sided Matching Decision Method of Electricity Sales Package Based on Disappointment Theory
## 1 Introduction
The process of this method is as follows: firstly, the priority vector of the electric power customers and electricity sales package is determined on the basis of an incomplete fuzzy preference relationship; then, a method to describe the satisfaction of electricity users and electricity sales packages according to disappointment theory is proposed; next, a multi-objective optimization model based on the two-sided matching method is proposed, which is aimed at maximizing the overall satisfaction of the matching between electric power customers and electricity sales packages; lastly, a case study of electric power customers in an industrial park in Zhejiang Province is demonstrated to verify the feasibility and effectiveness of the matching decision-making method of the user's electricity sales package considering incomplete fuzzy preference. The characteristics of disappointment theory include its asymmetric sensitivity, dual-threshold effect, abstention effect, and intuitive effect. Asymmetric sensitivity refers to the fact that both matching parties are more sensitive to disappointment. The dual threshold effect refers to the existence of two thresholds for the sensitivity of both matching parties to risk. When one threshold is reached, the sensitivity to risk increases, and, when the other threshold is exceeded, the sensitivity to risk decreases. The abstention effect refers to the fact that both parties in the match will give up the option with higher returns due to fear of disappointment. The intuitive effect refers to the fact that, when faced with a large number of risks and decision-making choices, both matching parties often make choices on the basis of intuition. In practical bilateral matching problems, users may have expectations about certain packages, and they may be disappointed if these expectations cannot be fulfilled. Conversely, they may be delighted if certain packages exceed their expectations. The characteristics of incomplete fuzzy preference are fuzziness, uncertainty, environmental dependence, relativity, and subjectivity. Ambiguity refers to the imprecise preferences given by both matching parties. Uncertainty refers to the hesitation phenomenon caused by the difficulty of predicting the consequences of each decision by both matching parties in decision making. Relativity refers to the fact that the decision results given by both matching parties will be influenced by the environment, resulting in discrepancies in the decision results. Subjectivity refers to the fact that every decision is the result of matching the subjective experiences and judgments of both parties. In the electricity market, users usually have a limited understanding of electricity sales packages, and the knowledge and information they possess are also limited. In this case, users can only provide a vague general preference relationship, but cannot accurately express detailed preferences. For example, they might indicate a preference for a certain attribute as \"high\" or \"moderate\" rather than giving a specific numerical value. This fuzzy preference relationship can better reflect the cognitive limitations of users on electricity sales packages. Furthermore, disappointment theory also plays a key role in this context. In the above text, we explained the concept of disappointment theory, whereby users have emotional experiences when faced with choices that may lead to disappointment. Users may have expectations for certain electricity sales packages, and they may be disappointed if these expectations cannot be realized. Conversely, they may be delighted if certain packages exceed their expectations. This psychological experience of disappointment and joy is one of the important driving factors behind user preferences. Combining fuzzy preference relations with disappointment theory can more accurately characterize user satisfaction. In the electricity market, due to the large number of packages, users are faced with the difficulty of making choices.