Indonesian Development of Economics and Administration Journal

Econometric Framework for Assessing the Impact of Private and Public Investment on Real GDP in Nigeria Using ARDL-ECM Technique

Ifeoma Florence Okpalanwabude — 2025-12-01

Nigeria’s economic growth performance has remained volatile despite sustained increases in both private and public investment over the years. This paradox raises concerns about the effectiveness, efficiency, and dynamic impact of different forms of investment on real gross domestic product (GDP). In the present study, real GDP was used as the dependent variable, while private investment, public investment, real interest rate, political stability, labour force participation, balance of trade, and inflation served as explanatory variables. The ARDL bounds test was applied to determine long-run relationships, and an Error Correction Model estimated short-run dynamics where cointegration existed. Stationarity was tested using the Augmented Dickey–Fuller test, while diagnostic tests ensured model reliability. Annual data from 1994–2023 were sourced from official databases and analyzed using EViews 10. The results indicated wide variation among Nigeria’s macroeconomic variables between 1994 and 2023. Inflation averaged 16.64% (max 72.84%), real interest rate averaged 3.54% (min –31.45%), and private investment averaged ₦9,001.31 billion, showing relative stability. Unit root tests revealed a mix of I(0) and I(1) variables, validating the ARDL method. The bounds test confirmed long-run relationships (F = 39.46 > 3.18). Long-run estimates showed private investment significantly increased GDP (4.55, p<0.01), while labour force participation (0.45) and balance of trade (0.64) were positive; inflation reduced growth (–0.05). Short-run results showed negative effects from private investment (–0.15) and inflation (–0.0013), with a 5% adjustment speed to equilibrium. The study concludes that policies aimed at improving the efficiency of public investment and strengthening the private sector investment climate are critical for sustaining long-term economic growth in Nigeria.

Effect of Work Discipline and Physical Environment on Employee Performance

Selviana Indiani — 2025-12-01

This study aims to analyze the effect of work discipline and physical work environment on employee performance at PT Galaxy Ion Teknologi, West Jakarta.

Methodology/approach – This research uses a quantitative associative method involving 75 employees selected through a saturated sampling technique. Data were analyzed using multiple linear regression, t-test, and F-test. The results show that work discipline significantly influences employee performance, indicated by a t value greater than the t-table and a significance level below 0.05. The physical work environment also has a significant positive effect. Simultaneously, both variables have a significant impact on employee performance, as shown by the F value exceeding the F-table with a significance level below 0.05. Novelty/value – The novelty of this study lies in highlighting how maintaining employee discipline and optimizing the physical work environment simultaneously improve performance, providing empirical evidence from a private technology company in West Jakarta.

The Influence of Store Atmosphere and Service Quality on Customer Satisfaction

Muhammad Adi Sanjaya — 2025-12-01

The purpose of this research is to determine the effect of store atmosphere and service quality on customer satisfaction at Domino’s Pizza Bintaro Kesehatan branch in South Jakarta.

Methodology/approach – This type of research uses associative research with a quantitative approach. The population in this research amounts to 22,540 consumers and the sampling technique uses the Slovin formula, sample of 100 respondents with data collection technique using a questionnaire. Data analysis includes validity testing, reliability testing, classical assumption testing, regression analysis, correlation coefficient analysis, determination coefficient analysis, and hypothesis testing. Findings – The results of this study indicate that store atmosphere (X1) has a positive and significant effect on consumer satisfaction. Service quality (X2) has a positive and significant effect on consumer satisfaction (Y). Store atmosphere (X1) and service quality (X2) simultaneously have a positive and significant effect on consumer satisfaction

The influence of service quality and price on consumer satisfaction

Ananda Cahyani — 2025-12-01

This study aims to determine the effect of service quality and price on consumer satisfaction at the Cafe Teras Kayoe in Balaraja, Tangerang Regency. Methodology/approach – This research method uses a quantitative approach, an associative research type. The study population consisted of 15,404 consumers, and a sample of 99 respondents using probability sampling techniques. Findings – The results of the study show that service quality and price have a positive and significant effect on consumer satisfaction. Novelty/value – The correlation coefficient is a very strong relationship, and the determination coefficient is 74.7%, The hypothesis test results show that Fcount > Ftable or 141.956 > 3.09 with a significance value of 0.000 < 0.05. Thus, service quality and price have a positive and significant effect on customer satisfaction.

Impact of Net Working Capital and Net Sales on Profitability of PT XYZ

Maula Rahmadona — 2025-12-01

This study aims to analyze the effect of net working capital and net sales on net profit at PT Mayora Indah Tbk during the 2014–2024 period. Methodology/approach – This study uses a quantitative method with annual financial report data for eleven years and is analyzed using multiple linear regression, t-test, F-test, and coefficient of determination with the help of SPSS software version 25. Findings – The results of the study show that net working capital has a significant positive effect on net profit, net sales have no significant effect, and simultaneously both have a significant effect with a determination value of 80.8%. Novelty/value – The novelty of this research lies in the long analysis period covering the COVID-19 pandemic and the finding that efficient working capital management plays a greater role in increasing profits than increasing sales.

The Influence of Price and Promotion on Purchasing Decisions for Honey Products

Sofia Nufus — 2025-12-01

The purpose of this study was to determine the effect of price and promotion on consumer purchasing decisions for calliandra honey products at the Nima Bali Store in South Jakarta. This type of research uses associative research, with a quantitative approach. The population in this study amounted to 2,751 consumers and the sample in this study amounted to 96 respondents. Data analysis used validity tests, reliability tests, classical assumption tests, regression analysis, correlation coefficient analysis, determination coefficient analysis and hypothesis testing. Partially indicates there is a significant influence between price on consumer purchasing decisions, significant influence between promotion on consumer purchasing decisions. And simultaneously results showed by F hypothesis test obtained a significance influence price (X1) and promotion (X2) on consumer purchasing decisions (Y)

The Influence of Return on Equity (ROE) and Debt to Equity Ratio (DER) on Stock Prices

Lusia Marleni Halek — 2025-12-01

The purpose of this study is to examine the effect of Return on Equity (ROE) and Debt to Equity Ratio (DER) on the stock price of PT Adhi Karya (Persero) Tbk during the 2014–2024 period, both partially and simultaneously. The study aims to determine whether profitability and leverage provide significant signals to investors and how these financial ratios influence the company’s market value over time. Methodology/approach – This research uses a quantitative method with a causal associative approach. According to Sugiyono (2018:65), a causal associative approach examines the relationship between two or more variables, where the relationship is characterized by cause and effect. In this study, the independent variables (ROE and DER) act as the influencing factors, while the dependent variable (stock price) serves as the factor being influenced. Findings – It The findings of this study indicate that Return on Equity (ROE) has a significant partial effect on the stock price of PT Adhi Karya (Persero) Tbk during the 2014–2024 period, as shown by a t-value of 3.491 and a significance level of 0.008 < 0.05. This result suggests that higher profitability provides a positive signal to investors, thereby increasing the company’s stock price. Novelty/value – This study provides novelty by analyzing the long-term impact of Return on Equity (ROE) and Debt to Equity Ratio (DER) on stock prices over an extended period of eleven years (2014–2024), focusing on PT Adhi Karya (Persero) Tbk, a state-owned enterprise in the construction sector.

Implications of Job Satisfaction on Productivity through Work Motivation, Work Environment, and Internal Communication in Serpong Building Depot Employees

Debora Hutagalung — 2025-12-01

This study aims to analyze the effect of job satisfaction on employee productivity through work motivation, work environment, and internal communication among employees of Depo Bangunan Serpong. In facing increasingly intense competition in the building materials retail industry, companies are required to enhance employee productivity as a key factor for organizational success. Employee productivity is influenced not only by technical factors and work systems, but also by psychological aspects and the work environment that shape job satisfaction. The hypothesis testing results indicate that work motivation has a positive and significant effect on productivity, the work environment has a positive and significant effect on productivity and internal communication also has a positive and significant effect on productivity. Work motivation, work environment and internal communication also have positive and significant effects on job satisfaction. Furthermore, job satisfaction has a positive and significant effect on employee productivity. The mediation test results show that job satisfaction mediates the effect of work motivation on productivity the effect of the work environment on productivity, and the effect of internal communication on productivity. These findings indicate that improving employee productivity can be optimally achieved through enhancing job satisfaction supported by strong work motivation, a conducive work environment, and effective internal communication.

Functional Specification of the Moderation Model Incorporating Public Investment and Tax Revenue Interaction Terms

Ifeoma Florence Okpalanwabude — 2025-12-01

Nigeria faces persistent challenges in mobilizing tax revenue to stimulate sustainable economic growth, raising questions about the role of public investment in enhancing or offsetting the effects of taxes. The study employs an ARDL framework to examine the moderating role of public investment on the relationship between selected tax revenues (corporate income tax and VAT) and Nigeria’s economic growth. Both short-run and long-run dynamics are modeled, with the error correction term capturing convergence toward long-run equilibrium. Interactive terms (LOGPUIV*CITR and LOGPUIV*VATR) reflect whether public investment enhances or offsets tax revenue effects. Positive coefficients denote complementarity, while negative values indicate substitution, highlighting efficiency in tax revenue utilization and public investment management. The study analyzed 30 years (1994–2023) of Nigerian time-series data on tax revenues, investment, and economic output. Descriptive statistics showed that average corporate income tax (CITR) was ₦784.94 billion, VAT revenue ₦711.63 billion, private investment ₦9,001.31 billion, public investment ₦1.63 billion, and real GDP ₦3.45 × 10¹¹, while labor force participation averaged 59.8%. Unit root tests indicated mixed integration orders, justifying ARDL modeling. Long-run ARDL results revealed that CITR (0.4472) and public investment (0.0896) positively affected output, VAT had a negative effect (–0.00003), while the interaction of public investment with CITR (–0.2412) reduced output, and with VAT (0.0612) increased it. The short-run ECM indicated a 26.1% speed of adjustment. Public investment positively moderates the impact of value-added tax but negatively interacts with corporate income tax. These results highlight the importance of strategic public investment in maximizing the growth potential of tax revenues and guiding economic policy for Nigeria’s sustainable development.

Impact of Absenteeism and Organizational Conflict on Employee Performance in Enugu State Civil Service, 2010–2019

Chibuike Chris Umeokafor — 2025-12-01

The lack of employee performance, efficiency, and service delivery in Enugu State Civil
Service has been perpetuated by persistent absenteeism and unresolved organizational conflict to
raise questions about weak motivation, poor management practices, and deteriorating productivity
in the public sector between 2010 and 2019. This descriptive work has been carried out in Enugu
State, Nigeria and has outlined the historical, geographic, economic and administrative environment
in which the Enugu State Civil Service is based. The study population is the civil service, which has
10,100 employees working in 20 ministries. Using Yamane formula, 385 workers were randomly
picked out of 10 ministries. Primary sources such as interviews with key officials and secondary
sources were used to collect data. Reliability and validity were upheld in the study, and the content
analysis of qualitative data was used to analyze absenteeism, organizational conflict, and employee
performance. The results show that absenteeism and organizational conflict are the most critical
issues that reduce the performance of employees within the Enugu State Civil Service. Job
insecurity, lack of motivation, delayed promotions, and poor working conditions are what cause
absenteeism, thus interfering with productivity and service delivery. Competition and limited
resources further diminish teamwork and morale when managed improperly, which leads to
organizational conflict. Nonetheless, it has been indicated that when conflict is managed effectively
and integratively, cooperation, innovation, and performance can be improved. The paper highlights
the importance of sound human resource management, enhanced employee morale, and active
conflict-management approaches to enhance output and service delivery.