The paper presents a comparative analysis of the dominant theoretical concepts and models of social entrepreneurship development in continental Europe and the United States. The initial assumption of the paper was the differences in the model of capitalism that are present in these parts of the world, and the dominant theoretical concepts determine the differences in the form of manifestation of social entrepreneurial activity and the degree of population involvement in its implementation. Empirical research, with the aim of testing this assumption, was conducted on a sample of 50,000 social entrepreneurs from 25 countries. The results showed that there are no significant differences in the degree of involvement of the population in social entrepreneurial activity between Europe and the USA in the initial phase. In the operational phase, there are differences in the degree of involvement of the population in social entrepreneurship between Europe and the USA, but they are also present between Eastern and Western Europe, which means that they are not predominantly conditioned by theoretical concepts and models of social entrepreneurship, but by other factors.

The paper investigates the impact of different factors on the establishment and development of social enterprises (SPs). The aim of this paper is to identify the key stimulants and restrictions of development of SPs in the Republic of Serbia, and to propose measures, the application of which can increase their long-term sustainability. The paper is based on exploratory research using data covering 27 interviews with founders of social enterprises in the Republic of Serbia. By applying the methods of regression analysis, it was found that favorable financial resources (especially grants) are the key stimulants for the establishment of social enterprises, while the enthusiasm of managers of social enterprises has the greatest impact on their development. It was found also that legal regulations and the macroeconomic environment, as well as difficulties in accessing the market, are serious restrictions on the establishment of social enterprises, while lack of knowledge in the field of marketing and management limit the development of social enterprises in the Republic of Serbia.

The paper analyses the contribution of different types of innovative entrepreneurship: new products entrepreneurship, new technology development entrepreneurship, high growth expectation entrepreneurship and average growth expectation entrepreneurship to economic growth in emerging markets. The aim of paper is to identify types of innovative entrepreneurship which have the greatest contribution to economic growth in emerging markets and propose measures that macroeconomic policy makers could implement to achieve sustainable economic growth. The regression analysis is performed in order to estimate the impact of different types of innovative entrepreneurship on economic growth in 13 emerging markets. The results have shown that a high growth expectation entrepreneurship has the greatest influence on economic growth. Also, results have shown that impact of new products entrepreneurship is bigger than impact of technology development entrepreneurship on economic growth in emerging markets.

The paper explains the concept of sustainable entrepreneurship, as a sub-concept of social entrepreneurship. The factors influencing the development of sustainable entrepreneurship are examined on the sample of 12,011 entrepreneurs and small and medium-sized enterprises (SMEs) offering a "green product" in 37 countries. The data used in the study are from the Flash Eurobarometer Report 426 (SMEs, Resource Efficiency and Green Markets). The results revealed that, according to the perception of sustainable entrepreneurs, the biggest impact on starting and developing a business in the environmental sphere can have: financial incentives, measures related to easier market access, technical assistance in the development of "green product", and advisory assistance in marketing and distribution of "green product".

Due to the influence of numerous factors that make it difficult to find the innovative solutions to social and environmental problems that social enterprises deal with, there is a need for a joint action of social enterprises, both with each other and with other actors operating in their environment. In order to overcome the challenges more easily, which they face in their business, social enterprises and social entrepreneurs should take advantage of networking. Business networks can bring many benefits to their members, and networks in the social sector are of particular importance. Recently, networking has taken place within the broader framework of so-called ecosystems. With this in mind, the aim of this paper is to shed more light on the specifics of networking of social enterprises, i.e. their connection to ecosystems. The Social Entrepreneurship Network (SEN) has played a key role in the development of this sector in European countries. Also in the Republic of Serbia, networking of social enterprises with civil society organizations has significantly contributed to the creation of public policies and the promotion of social enterprises.