## 2 Literature Review  
The literature review covers the development of cutting-edge digital production and information technologies. The maturity level of these technologies is very heterogenous. The authors did not intend to assess the relative impact of each technology on the development of micrologistic systems. The review is aimed at demonstrating that digital technology is developing and, consequently, there is need for assessing the impact they make on logistic systems. The main trend of modern technological development is the convergence of advanced production and digital information technologies [9; 10]. The development of intelligent sensors has triggered a breakthrough in this field. A distinctive feature of intelligent sensors is their ability for self-recovery after a single failure. Sensors of this type are referred to as'smart sensors' in the English-speaking scientific community [11]. Today, there are intelligent sensors with built-in electronics, including a microprocessor, a digital signal processor, and a digital interface that supports network protocols for communication. The intelligent sensor can be embedded into a wireless or wired sensor network, due to the self-identification function in the network with other devices. The capabilities of intelligent sensors and the convergence of advanced manufacturing and digital information technologies allow for the creation of social-cyberphysical systems [12; 13]. The following technologies have the greatest influence on the development of a micrologistics systems of various levels and types: Internet of things and production automation [14]; digital design and modeling [15]; virtualization and cloud computing technologies (virtual cloud infrastructure for business) [16]; mobile technologies and cross-channel communications [17]; technology of unmanned aerial systems [18]; artificial intelligence technologies, big data analytics, robotics, 3D printing and various types of digital Internet platforms [19; 20; 21]. The examples of advanced manufacturing technologies with integrated digital information technologies are the following: automated design and engineering, flexible manufacturing centers, robots, automated guided vehicles, automated storage and retrieval systems. All of them can be connected into a single flexible production system and ultimately be integrated into a single automated enterprise or an integrated computer production system [22; 23]. The convergence of production technologies with digital information technologies leads to increased productivity, the emergence of new markets and the creation of new business models and services [24; 25; 26]. Digital transformation of logistics systems is a multifaceted process where digital technologies are introduced at different stages of the production chain, as well as in management systems at the level of companies and government agencies. As technologies evolved, automation processes have been augmented with elements of informatization and digitization. In fact, all these components have become an integral basis for digital transformation at the level of micro-logistics systems, at the level of macro-logistics systems, and at the level of mega-logistics systems. Digital transformation of logistics systems is a multifaceted process where digital technologies are introduced at different stages of the production chain, as well as in management systems at the level of companies and government agencies. As technologies evolved, the automation processes have been augmented with elements of informatization and digitization. In fact, all these components have become an integral basis for digital transformation at the level of micro-logistics systems, at the level of macro-logistics systems, and at the level of mega-logistics systems. In any case, the efficiency with which these systems can operate is a crucial factor for any type of systems involving digital transformation technologies. Efficiency is one of the most general economic concepts that does not yet have a universally accepted definition.