This study aims to analyze code switching and code mixing in the interaction between sellers and buyers at Sanggau Central Market, based on the types and causal factors. The benefits of this study are to increase insight into codes, code switching, and code mixing that occur in the interaction between sellers and buyers in the market. The method used in this study is a descriptive method with a qualitative approach. Data collection techniques are carried out directly through observation and recording techniques. The recording process is carried out with the help of electronic devices such as gadgets. Based on data analysis, this study concludes that there are 12 types of code switching data, while code mixing amounts to 50 data. The factors causing code switching consist of 12 data, which are influenced by the listener or interlocutor and changes in the situation due to the presence of a third party. Meanwhile, the factors causing code mixing consist of 50 data, which are influenced by the speaker himself and interactions with the interlocutor.
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