The world of work and employment underwent substantial changes during the past few decades. Economic globalisation as a process of increasing transnational trade liberalisation and market expansion in developing countries, and availability of ground-breaking innovations in information and communication technology were – and continue to be – two major drivers of this change. Transnational flows of goods and commodities, of capital, and of human labour promoted an unprecedented global interconnectivity. In high-income countries (HICs), new developments of work became evident, such as a rapid growth of service, information and communication occupations and professions, in conjunction with a decrease of the industrial sector, a widespread technological transformation of jobs, and an augmentation of flexibility, diversity, and insecurity of employment conditions, including a growth of nonstandard work. If compared to the industrial stage of development, main challenges of occupational safety and health in these countries shifted from a main concern about noxious material (chemical, physical, biological) work environments and from occupational injuries to a main concern about psycho-mental and socio-emotional stressors at work, evolving from work intensification, mental challenges, interpersonal conflicts, threatening employment conditions, and rapid adaptation to changing job tasks and job trajectories [
1]. Accordingly, at the level of scientific analysis, the scope was extended beyond the traditional disciplines of occupational medicine and safety sciences to include psychological, social, behavioural, and organisational aspects, promoting occupational health science as an inter-disciplinary approach [
2,
3,
4]. To date, a solid body of knowledge on new occupational risk and protective factors is available, and many HICs have extended their monitoring and prevention activities at work to address these new challenges [
5].
In a sharp contrast to this development, occupational safety and health in most middle-income countries (MICs) is faced with substantial difficulties of tackling noxious material work environments and occupational injuries in agricultural and industrial sectors of productivity, of improving access to paid work and reducing informal employment, and of providing basic social protection, including health care, rehabilitation, unemployment benefits, and pensions. Moreover, universal human rights and antidiscrimination policies need to be enforced at work [
6,
7]. Against these far-reaching threats resulting in a high burden of work-related diseases and human suffering, any reference to problems related to psychosocial occupational health seem to be misplaced. Yet, despite substantial differences in working conditions and health between countries in the Global North and rapidly developing countries in the Global South – differences that are even aggravated by the COVID-19 pandemic – the world of work in MICs is being rapidly transformed through economic globalisation, technological innovations, and increased worldwide interconnectivity, sharing several concerns with modern Western societies. Challenges of psychosocial occupational health are considered one such shared concern, given globally experienced threats of job insecurity, often combined with growing work intensity, and given a rapid pace of changing work demands and work environments (see next section). Against this background, it is of interest to examine to what extent scientific research originating from MICs has already addressed these latter challenges. To this end, in a further section of this contribution, a narrative review of recent interdisciplinary occupational health research is given, with a selective focus on two regions, Asia Pacific and Latin America.
2.1. Work and Health in Middle-Income Countries: Differences and Assimilation to the Global North
A few years before the outbreak of the new pandemic the United Nations’ Sustainable Development Goals (SDGs) were declared and subsequently adopted by a large number of member states. One of these goals, SDG 8, calls for the promotion of productive employment and decent work [
8]. At that time, it was evident that working and employment conditions differed substantially between the regions of the world, most obviously between high-income-, middle-income-, and low-income countries. In its World Employment Social Outlook in 2018, the International Labour Organisation (ILO) estimated that every third worker in developing countries was living in extreme poverty, and many more were in vulnerable employment (own-account workers and contributing family workers) [
9]. Although extreme poverty was significantly reduced in emerging countries, the pace of reduction slowed down, and more than 400 million people were left in moderate working poverty in developing and emerging countries [
9]. Informal employment remained extremely high in low-income countries, with less than twenty percent of workers being formally employed, as compared to some sixty percent in upper-middle-income countries, and some eighty-seven percent in high-income countries [
10]. Unemployment and under-employment continued to be main concerns in the Global South, in concert with massive restrictions of social protection and civil rights.
While far-reaching decent work deficits were substantial in these parts of the world, MICs experienced some progress. According to the World Bank’s classification, MICs are characterised by gross national income per capita ranging between low and high-income countries. Moreover, they are distinct by a strong increase in gross domestic product over the past twenty-five years. Six countries stand out in this regard, Brazil, China, India, Indonesia, Mexico, and the Russian Federation [
11]. Despite national variations these countries underwent a process of structural transformation with three dominant features. First, the proportion of people employed in agriculture declined quite strongly. Compared to the year 1991, the percentage in these countries was reduced from fifty-one percent to twenty-seven percent by 2017 [
11]. At the same time, as a second feature, the industrial sector did not grow as expected from previous developments in HICs. Overall, about a quarter of the workforce was employed in industry, but many jobs remained of low quality. In the context of economic globalisation, industrial productivity was dominated by multinational corporations operating from the Global North, such that the contribution of the manufacturing sector on economic progress within MICs remained constrained. Third, during this time period, a rapid increase of the service sector was observed, absorbing currently about half the employed population of these six countries. The main problem of this latter development consists in the fact that employment growth was largely limited to low-productivity service sectors, such as retail trade or low-skilled information and communication jobs, offering poor and insecure working conditions and low pay [
11]. In consequence, the level of precarious work in MICs is still high, with more than forty percent considered as being in vulnerable or informal employment. However, while India and Indonesia document highest proportions, trends in Russia, Mexico and Brazil are more favourable, and China witnessed the sharpest decrease in vulnerable employment over time [
11].
These difficulties and disadvantages among working people in MICs were aggravated by the COVID-19 pandemic. Compared to the workforce in HICs, rates of infection, severity of disease, and fatality rates were substantially higher, not least due to lack of vaccination and restricted access to hospital treatment. Moreover, lockdown measures, job loss, and lack of financial and social support from national policies exacerbated human suffering and triggered a mental health crisis [
12,
13]. The pandemic widened social inequalities in health that dominated the spectrum of morbidity and mortality [
14]. Several socioeconomically disadvantaged groups became extremely vulnerable by this pandemic. International migrant workers from Asia and the Pacific are one such group. Hired by labour markets as temporary workers, they immediately lost income and job through lockdown measures, and due to lack of social protection, they suffered from a humanitarian crisis. According to a report, over 90 million people were affected by this fate [
15].
These few observations underline the fact that the pandemic worsened the already disadvantaged working and living conditions in large parts of populations in MICs. Of concern, promising small increases of economic and social development emerging since the 1990s in these countries were suddenly abolished. However, there are also some promising developments in emerging economies. Young generations entering the labour market are much better educated than previous generations, offering a broad spectrum of technological skills and competences. For instance, in upper-middle-income countries, some thirty percent of the workforce only are estimated to be undereducated with regard to the demands of the labour market (and some twenty percent are estimated to be overeducated), whereas the percentage of undereducated amounts to seventy percent in low-income countries [
16]. Skill match is an important driver of productivity gain and economic growth. In some Asian countries, IT expertise and advances of digitization and artificial intelligence are widely prevalent, supported by expanding collaboration of distinct national higher education elites with centres of excellence in world leading training and research centres. Not least in reaction to lockdown measures, the COVID-19 pandemic has accelerated the implementation of technological innovations in these regions. Remote work, digital work, rapid automation, and e-commerce suddenly expanded. Delivery services via digital platform, such as on- demand physical services or crowd work, are a prominent example. Moreover, the pandemic has accelerated the automation of tasks in a large number of globally operating businesses [
17]. As a further side effect of economic globalisation, a considerable part of workers in MICs are employed in the global supply chain economy with strong linkages to HICs. Through these linkages, employment regulations were improved, securing wages and basic safety protection [
16]. Thus, at least some parts of the workforce in MICs share common features of work and employment with their colleagues in advanced societies, being exposed to challenging job demands, applying newly acquired skills, and dealing with the physical and psychosocial risks of modern work and employment. Overall, according to Peters et al. [
17], the COVID-19 pandemic has highlighted the importance of work for the health of working populations in unprecedented ways. Employers and other stakeholders of enterprises were urged to invest in occupational safety and health, and government agencies expanded their capacity to collect and analyse data on working conditions and health, using them as evidence base for developing preventive programmes. At national level, integrative labour and social policies were prioritized as measures of longer-term protection and health promotion, and investments in the workforce and institutions of occupational health and safety were intensified. International organisations developed a set of recommendations for policy and practice on how to cope with the challenge of the pandemic and the post-pandemic world of work [
17]. It is hoped that these multi-level interventions strengthen the quality of work and health in middle-income countries as well.