This study aims to analyse the market structure, conduct, and performance of the star hotel industry in North Sumatra. The study was conducted in 2019 with time series data for the period of 2013 to 2018. The market structure is measured using the methods of concentration ratio, Herfindahl-Hirschman index, and barriers to entry, while descriptive methods are used to analyse the conduct and performance of five-star hotels. The results of the study show that: (i) there is a concentration of three- and four-star hotels, and that the concentration of four- and five-star hotels have an oligopolistic structure; (ii) the market structure of star hotels tends to be monopolistic; (iii) the minimum efficient scale index of star hotels is relatively small, which means that new hotels have a good opportunity to get a larger market share; (iv) the level of service and the level of availability of star hotel facilities are classified as good; and (v) the star hotel market structure influences hotel business behaviour in North Sumatra, which in turn affects hotel business performance.

Objective.  This study aims to identify and analyze consumer considerations factors in online purchasing decisions with trust as a moderating variable. Research Methods.This research is an associative research. The population in this study were students of the Study Program of Master of Management, Postgraduate, Universitas HKBP Nommensen Medan who had made online purchases. The number of samples was 80 respondents who were taken using purposive sampling technique. Primary data collection used questionnaires and secondary data collection used literature study. Testing the hypothesis in this study used linear regression analysis and interaction test with a significance value of = 5% (0.05). Results.The results showed that the variables of consumer consideration factors and consumer confidence had a positive and significant effect on online purchasing decisions for students of Postgraduate Management Master Program. Consumer trust was able to strengthen the influence of consumer considerations factors on consumer purchasing decisions online. Conclusion.All aspects contained in these variables consisting of price, product, ease of transaction and transaction security have a significant positive influence on consumer purchasing decisions to shop online. The better and clearer the practice of prices, products, convenience and security of transactions provided by companies or individual online sellers, the easier it is for consumers to make purchasing decisions.

This study aims to analyze the effects of Risk Based Bank Rating components on company stock prices. The Risk Based Bank Rating (RBBR) components consist by LDR, GCG, ROA and CAR. Secondary data was uses in this study with numbers of samples 196 consisting by 42 companies and 3 years financial report. Multiple linear regression was used to analyze the data. The result shows that LDR and GCG have negatively and significantly affected to stock prices. ROA has positively and significantly affected price stock. CAR has positively but insignificantly affected the price stock. Simultaneously, LDR, GCG, ROA and CAR have positively and significantly affected price stock. For further research using other variables related to analyzing the price stock are suggested to use.

Information about willingness to pay (WTP) essentially aims to protect consumers from the abuse of monopoly power owned by companies in the supply of quality products and prices. The consumer's WTP of a product can be an appropriate basis in determining the pricing policy for a product because he can reveal the true value or price of the product based on consumer perception. The price proxy with the WTP can still meet the assumption of the traditional demand model (Marshallian demand model) where the price is not set (regulated) by the government. WTP can be obtained by using a contingent valuation method.