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Agro Ekonomi ◽  
2021 ◽  
Vol 32 (2) ◽  
Author(s):  
M Rondhi

Contracts participation between tobacco farmers and traders is still low even benefit of contract is huge. This is related to factors that affect to the contract, demographics, farm characteristic, and other related factors.  Contracts that initially became a tool to prevent market failure because it regulates how economic actors act against other, turns out to cause transaction costs as a result of asymmetric information that makes the contract does not function ideally. Therefore, this study attempts to explain asymmetry information during the transfer product and the potential transaction costs incurred using the New Institutional Economy approach. Beside that, this study also attemps to explain factors that underlie farmers decision making partnership, that were analized by using the analyst logistic regression.Respondents in this study were 100 respondents, 50 tobacco contract farmers, and 50 independent farmers from December 2018 through January 2019. The results showed that asymmetric information caused adverse selection and moral hazard, as many as 30% farmers had sold products to other parties and 8% of farmers had used pesticides that prohibited by traders. Contracts that are not ideal due to asymmetric information must be re-enforced by using additional costs called transaction costs which are divided into three typess, namely search and information costs, cost to design, negotiate and conclude and the monitor and contract enforcement costs. Monitoring costs have the potential to absorb the largest portion compared to other types of transaction costs. The greater the asymmetric information generated, the greater the transaction costs incurred. Then the factors that significantly influence the decision making of tobacco farmers to partnership are long time farming experience, land size, risk aversion level, certainty of price and source of capital.


2021 ◽  
Vol 6 (3) ◽  
pp. 281-287
Author(s):  
Amirotul Muniroh ◽  
Rizdania

The need for media that supports online learning is increasing along with the Covid-19 pandemic that is spreading in the world. The learning media is expected to be in the form of media that is easy to use and does not require additional costs incurred by students. One application that is widely used today is Telegram. The application provides a telegram bot facility that can assist teachers in delivering the material they are taught. By using the telegram bot, students can easily use applications on their mobile phones without installing additional applications. This study discusses the development of online learning methods using telegram bots as a medium for delivering material to students using the approach of UCD. This study used usability testing to evaluate the Telegram bot as the media for flipped learning. There are five indicators measured in the usability evaluation we used in this research. The result of the assesment is 83.56%.


Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 42
Author(s):  
Joanna Rzempała ◽  
Daniel Borkowski ◽  
Artur Piotr Rzempała

The purpose of the article is to define the risk factors in cogeneration projects and to demonstrate that a lack of sufficient identification of risks in different phases affects project implementation. A theoretical study is conducted, which aims to identify risk factors in cogeneration projects, based on case studies of such projects in Poland. The study offers a view at CHP (combined heat and power) projects as extremely dependent on the external environment of the organisation. These projects are subject to many external regulations due to their environmental impact and dynamically changing technical aspects. The biggest technical errors occur at the planning and construction stages. The biggest economic and financial risks occur at the execution stage after 2% and 3% of additional design costs occur, respectively. The authors estimated the risks at different stages of the project and concluded that the total cost of failure in correct identification of the risks at the planning stage exceeded PLN 1.5 billion, which amounted to almost 60% of the total additional costs of materialised project risk. Consequently, the biggest challenges in the area of CHP project management at the planning stage are a thorough identification of risks, and the pricing and planning reactions to risk.


Author(s):  
G. M. Gospodarenko ◽  
◽  
O. D. Cherno ◽  
A. T. Martynyuk

The issues of recoupment of nitrogen fertilizers are considered, since they determine the need for fertilizers and the agro-economic efficiency of their use. It is shown that the payback of fertilizers is a complex value and not constant in different crops. The increase in yield from fertilizers in kind is taken on the basis of field experiments with fertilizers carried out on podzolized chernozem of the opita field of the Uman NUS. The cost of an increase in the yield from the use of nitrogen fertilizers was determined by the average actual sales prices of products prevailing on the market through various sales channels in the 6th quarter of 2021. Additional costs included: the cost of fertilizers, a margin for their delivery to the farm, the cost of using it on the farm and collecting increase in yield from nitrogen fertilizers. The cost of ammonium nitrate was taken at UAH 24,000 / t with the addition of a margin for their delivery to the farm. The costs of using fertilizers on the farm and collecting an increase in yield were set calculated according to the accepted standards. The difference between the value of the yield increase (PU) and additional costs (AD) gives the net income received from the use of fertilizers. The ratio of the cost of increasing the yield to additional costs shows their payback. On the basis of comparing the indicators of PU and DZ, the boundaries of the economic efficiency of the use of fertilizers were determined: PU> DZ (general expression of the task). We also calculated the minimum required increase in yield from fertilizers and the limits of price increases for nitrogen fertilizers. It has been established that at a price of ammonium nitrate of UAH 24,000 / t and the cost of its use in optimal doses for field crops against the background of a balanced phosphorus-potassium nutrition, the cost of an increase in yield is 3075–47894 UAH/ha. Payback of 1 kg a.c. nitrogen fertilization varies in a wide range – from 3.0 to 217.3 hryvnyas, depending on the crop. The limit of the unprofitable price per unit of the active substance of nitrogen fertilizers at the optimal application rate depends on the crop and is in the range of UAH 76.5–219.0 /ha. With the current disparity in prices for crop products and ammonium nitrate (24,000 UAH/t), its use is profitable, which is explained by the low ability of podzolized chernozem to provide plants with nitrogen, biological requirements of crops for this food element and technologies for their cultivation. Key words: nitrogen fertilizers, agricultural crops, fertilizer recoupment, loss threshold, price increase limit.


Author(s):  
G. M. Gospodarenko ◽  
◽  
A. T. Martynyuk ◽  
E. D. Cherno

The issues of the recoupment of potash fertilizers are considered, which is one of the most controversial in agronomy, since it is precisely this that determines the need for fertilizers and the economic efficiency of their use. It is shown that the payback of fertilizers is a complex value and not constant in different crops. The increase in yield from fertilizers in kind is taken on the basis of field experiments with fertilizers carried out on podzolized chernozem in the Uman NUS. The cost of the increase in yield from the use of potash fertilizers was determined by the average actual sales prices of products prevailing on the market through various sales channels in the 6th quarter of 2021. collecting a yield increase from potash fertilizers. The cost of potash fertilizer was taken at the current price of 16000 UAH/t with the addition of a margin for their delivery to the farm. The costs for the use of fertilizers on the farm and for collecting the increase in yield were set calculated according to the accepted standards. The difference between the value of the yield increase (YI) and additional costs (AC) gives the net income received from the use of fertilizers. The ratio of the cost of increasing the yield to additional costs shows their payback. On the basis of comparing the indicators YI and AC, the boundaries of the economic efficiency of the use of fertilizers were determined: YI>AC (general expression of the task). The minimum necessary increase in yield from fertilizers and the limits of the increase in prices for potash fertilizers were also calculated. It has been established that at a price for potassium chloride of 16000 UAH /t and the cost of its use in optimal doses for field crops against the background of a balanced nitrogen-phosphorus nutrition, the cost of an increase in yield is 1164–14820 UAH/ ha. Payback (unprofitableness) of 1 kg. potash fertilizers vary in a wide range – from – UAH 18.6 to 104,0, depending on the crop. The limit of the unprofitable price per unit of the active substance of potash fertilizers at the optimal dose of application depends on the crop and is in the range of 6.9–129,5 UAH/ha. With the current disparity in prices for crop products and potassium chloride, its use is unprofitable for winter rye, spring barley, grain sorghum and sugar beet (when applied against a background of 40 t/ha of manure). This is due to the availability of podzolized chernozem with mobile potassium compounds, biological characteristics of crops and technologies for their cultivation.


Pomorstvo ◽  
2021 ◽  
Vol 35 (2) ◽  
pp. 215-223
Author(s):  
Ana Grbčić ◽  
Svjetlana Hess ◽  
Mirano Hess ◽  
Tomislav Krljan

The major cause of under-capacity or overcapacity at smaller airports is seasonality. Such airports are finding it difficult to determine the capacity to meet the demand and adequately handle passengers in both high and low season. If the capacity is not optimally defined, excessive congestions and waiting times occur, resulting in lower service quality. Airports greatly benefit from capacity utilization analysis in terms of more accurate planning, designing, and adjusting capacity to the current demand in order to encourage further development as well as to reduce additional costs. Using queuing theory, this paper aims to answer the following question: is the passenger capacity at Rijeka International Airport (Croatia) optimally determined to meet the demand promptly, both in high and low season, without causing excessive congestions and waiting times. The results obtained indicate the occurrence of overcapacity since high season demand can be well served, even with reduced capacity used in the low season when demand is significantly lower.


2021 ◽  
Author(s):  
Yannick Cyiza Karekezi ◽  
Thomas Øyvang ◽  
Jonas Kristiansen Nøland

A new approach to predict the additional costs of reactive power system services delivered by large hydrogenerators is proposed in this letter. It is based on the application of the accumulated average efficiency (AAE), which has recently been proposed. An optimal operational path within the capability diagram with minimal losses is derived. This path can be used to calculate additional losses from operational regimes deviating from the optimal one for each active power level. Finally, the additional losses are accumulated in a similar manner as the AAE to estimate the extra cost of the operational regime, with ideal operation as the reference. In addition, the accuracy of a data clustering approach is explored to speed up the computation of the AAE and the accumulation of additional costs.


2021 ◽  
Author(s):  
Yannick Cyiza Karekezi ◽  
Thomas Øyvang ◽  
Jonas Kristiansen Nøland

A new approach to predict the additional costs of reactive power system services delivered by large hydrogenerators is proposed in this letter. It is based on the application of the accumulated average efficiency (AAE), which has recently been proposed. An optimal operational path within the capability diagram with minimal losses is derived. This path can be used to calculate additional losses from operational regimes deviating from the optimal one for each active power level. Finally, the additional losses are accumulated in a similar manner as the AAE to estimate the extra cost of the operational regime, with ideal operation as the reference. In addition, the accuracy of a data clustering approach is explored to speed up the computation of the AAE and the accumulation of additional costs.


Author(s):  
Willem Trommelen ◽  
Konstantinos Gkiotsalitis ◽  
Eric C. van Berkum

In this study, we introduce a method to optimally select the crossover locations of an independent rail line from a set of possible crossover locations considering a fixed number of crossovers that must be used in the design. This optimal selection aims to minimize the cost of passenger delay. Previous research showed that including passenger delay in the decision of rail design choices could be beneficial from economic and societal perspectives. However, those studies were only able to evaluate a few alternatives, because the degraded schedules had to be determined manually. In this research, we introduced an integer nonlinear model to find the best crossover design. We further developed an algorithm to evaluate a set of crossovers and determine the cost of delays for all segments on a rail line given a set of potential disruptions. The monetized cost of passenger delays was used to analyze the tradeoff between the unreliability costs emerging from the delay of passengers in the case of disruptions, and the total number of required crossovers. Our model was applied on a light rail line in Bergen (Norway) resulting in 10% reduction in relation to passenger delays without increasing the number of crossovers; thus, ensuring that there were no additional costs.


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