In recent years, retail investor participation in Southeast Asian capital markets has surged, contributing to increased market volatility and making sentiment analysis a critical factor in understanding price dynamics. This study investigates the relationship between social media sentiment and stock market fluctuations by focusing on Twitter data during periods of market volatility in Indonesia, Thailand, and Malaysia. The objective is to examine how collective investor emotions, as expressed through social media, correlate with daily stock index movements. Employing an exploratory quantitative approach, the study integrates Natural Language Processing (NLP) methods, both lexicon-based tools such as VADER and advanced transformer-based models like BERT and GPT, to classify over 150,000 tweets into positive, negative, and neutral sentiments. Sentiment scores were then aggregated and statistically tested using Pearson correlation with daily stock index returns, specifically the IDX Composite, SET Index, and FTSE Bursa Malaysia. The findings reveal a significant negative correlation between negative sentiment and market returns, particularly in the IDX Composite (r = -0.61, p < 0.05), indicating that pessimistic sentiment is associated with market downturns. Thailand’s SET Index and Malaysia’s FTSE Index showed moderate to weak negative correlations, with r = -0.43 and r = -0.27, respectively. These results highlight the sensitivity of emerging markets to emotionally driven retail behavior. The study concludes that AI-based sentiment analysis offers a valuable early warning tool for market volatility and can complement traditional financial indicators. It recommends developing AI-based sentiment dashboards and enhancing digital financial literacy to mitigate emotional reactivity among retail investors.

Rantau Rasau Village, which is one of the villages in Berbak sub-district, Tanjung Jabung Timur district. To get to Rantau Rasau village we have to use river transportation services in the form of ketek (a type of large boat equipped with a robbins engine), this water transportation. It is the only access to Rantau Rasau village because there is no land road to the village. This thesis aims to determine the role of air transportation in the economy of the people of Rantau Rasau village, East Tanjung Jabung district, to find out what obstacles exist in the use of this transportation.This research is qualitative research with descriptive methods, data collection techniques using interviews, observation and documentation. The results of the research show that the role of air transportation in the economy of the Rantau Rasau village community, East Tanjung Jabung Regency, includes mobility for people in and out of the village and also as a bridge for all economic activities of the Rantau Rasau village community. Obstacles in using this transportation service are tides and unpredictable weather conditions.
 
Keywords: Water Transportation, Community Economy, Watershed