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This study aims to analyze inventory control of catfish seeds at ABC Company by comparing the conventional inventory method represented by the Economic Order Quantity (EOQ) approach and the Just In Time (JIT) system in order to improve cost efficiency. This research employed a descriptive quantitative approach using a case study design. Data were collected through direct observation, semi-structured interviews with company management, and documentation of inventory and cost records for the 2024 operational period. The analysis method involved calculating optimal order quantities, ordering frequency, delivery frequency, and total inventory costs using EOQ and JIT formulas, followed by a comparative cost efficiency analysis. The results show that the conventional method resulted in a total inventory cost of Rp 75,050,000 per year with high ordering frequency. In contrast, the implementation of the JIT system reduced inventory costs to Rp 18,762,500 per year, achieving a cost efficiency of 72%. These findings indicate that the JIT system is more cost-efficient than the conventional method; however, its implementation requires careful consideration of supplier capacity, logistics readiness, and biological risks associated with live inventory. This study contributes empirical evidence on the applicability of JIT in the aquaculture sector, which has different characteristics from manufacturing industries.

To be able to attract customers companies apply different approaches but when viewed from the factors that influence consumer buying decisions on a product both goods and services the consumer behavior approach system is shown in searching, buying, using, evaluating, and spending products and services that they expect to satisfy their needs, Kanuk & Schiffman (2010). This study aims to determine and analyze the factors that influence customer interest in using logistics services at PT Monang Sianipar Abadi Kargo Semarang. To achieve this goal descriptive research was conducted using the methods of observation, in-depth interviews, literature study, documentation, and questionnaires. The results showed that sales promotion, building relationships with the community, direct marketing, price affordability, price competitiveness, price compatibility with service quality, service in accordance with customer requests, speed of document service and the ease with which customers can obtain information and respond to customer complaints will give a positive impression of each customer has a positive and significant effect on attracting customers to use logistics services at PT. Monang Sianipar Abadi Kargo Semarang.