Pengaruh Kelengkapan Produk, Promosi Penjualan, dan Kualitas Pelayanan Terhadap Keputusan Pembelian di Super Iwan Jaya Kutoarjo

The retail business sector in Indonesia is experiencing dynamic and competitive
growth, driven by shifting socio-economic conditions and changing consumer
behavior. Super Iwan Jaya Kutoarjo, a retailer specializing in smartphone
accessories and spare parts, faces this competitive landscape, as evidenced by
sales fluctuations between November 2025 and January 2026. Preliminary
observations indicate that consumer purchasing decisions are heavily influenced
by three key factors: product completeness (55.6%), sales promotions (19.4%),
and service quality (13.9%). This study aims to analyze the influence of product
completeness, sales promotions, and service quality—both individually and
simultaneously—on consumer purchasing decisions at Super Iwan Jaya Kutoarjo.
A quantitative approach was employed, utilizing primary data collected through
questionnaires distributed to Super Iwan Jaya Kutoarjo customers. The sample
was selected using a purposive sampling technique. Data were analyzed using
SPSS via multiple linear regression analysis. The results demonstrate that product
completeness, sales promotions, and service quality each exert a positive and
significant influence on purchasing decisions. Furthermore, the three variables
collectively were found to have a significant impact on consumer purchasing
decisions at Super Iwan Jaya Kutoarjo.