درخت حوزه‌های تخصصی

As a key tool in implementing monetary policy and government financing, government bonds play an essential role in financial markets. By means of Islamic financial innovations in the Islamic capital market, the instrument of Islamic treasury bill is published and tradable in the over-the-counter market. Islamic treasury bills have many risks in terms of execution, including the ease of trading and liquidity in the secondary market. Therefore, this research aims to examine some microstructural elements of government bonds using a vector autoregressive model. In this article, the effect of trading volume on bid-ask spread of orders has been investigated. To survey the impact of these variables, the vector autoregressive (VAR) model has been used on intraday data of 17 symbols of Islamic treasury bills in the over-the-counter market, which had the most trading days from 2021 to September 2023. According to the studies, there is a significant relationship between the trading volume and bid-ask spread only in Islamic treasury bills with long-term maturity. Therefore, the effect of the bid-ask spread of orders in different periods is greater than the trading volume, especially in longer-term Islamic treasury bills. Hence, in this research, by analyzing the impulse response function, if there is a shock on the variables, the effect of the trading volume's shock remains for several periods and affects unremarkably the bid-ask spread of orders in most of the short-term and long-term Islamic treasury bills, while effects of the bid-ask spread shocks during initial periods for long-term and short-term Islamic treasury bills is excellent, but decrease sharply during the following periods. These results help traders pay attention and reduce the risk of trading in the over-the-counter market, specifically the long-term treasury bills.

The purpose of this study is to investigate the impact of digital transformation on audit efficiency in companies listed on the Iranian capital market. Audit delay is used as a key measure to evaluate audit efficiency. To assess digital transformation, an index based on the frequency of keywords related to digital technologies, such as "Internet of Things," "Artificial Intelligence," "Cloud Computing," and "Big Data," in annual reports of companies is calculated. Control variables include company size, financial leverage, board independence, ownership concentration, Return on Assets (ROA), company losses, and CEO duality.This research is applied and descriptive survey in nature, and data were collected from financial reports of companies listed on the Tehran Stock Exchange between 2018 and 2022. Data analysis was performed using linear regression and the Eviews software, with the study adopting a panel data methodology.The results indicate that digital transformation negatively affects audit efficiency, leading to increased audit report delays. Additionally, companies with higher levels of digital transformation experienced more significant audit delays. These effects were particularly evident in firms with higher financial leverage and lower ownership concentration.This study highlights that digital transformation presents new challenges for the auditing profession, emphasizing the need for enhanced skills and the adoption of relevant technologies in the audit process