There are three possible negatives associated with teenagers working:

Most of that research has been limited to examining the number of hours teenagers work and the high school dropout rate, however, and has concluded that "a little bit of work is good for kids; a lot of work is bad for them," says McNeal, an assistant professor of sociology. But, he says, "given the complexities of today's employment possibilities for adolescents, examining the relationship between work and dropping out should encompass more than just employment intensity."

There are three possible negatives associated with teenagers working:

Teenagers Should Work Work is part of a person’s life

More teenagers work part-time after school | Mackay Daily Mercury

Teenage work is rarely treated as a specific category when labour issues are analyzed in Canada. It is categorized with ‘youth’ labour in statistic collections and analysis, a category that covers those in the 15-24 age group. These workers are normally treated as a homogeneous category, yet substantial differences exist in the work experience of someone who is 15 from someone who is 24. In this study a general overview of teenage work in Canada will be given, but the primary focus for the interviews was to understand the conditions of teenage workers who are still in an educational institution. This is because of the rise in expectations that teenage students will work and the increased time they are spending in the paid labour force.

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The resources for this paper rely on government statistics and documents, published material, and interviews with teenagers. The in-depth interviews focused on issues related to the gendered differences in youth labour experiences, the conditions of teenage work in BC, and the extent that students understand their workplace rights. Each teenager in the study undertook a written questionnaire and participated in either an individual interview or a group discussion. Group discussions focused on experiences such as gender differences in task selection and general treatment on the job, perceptions and knowledge of employment standards, perceptions of ‘safe’ and ‘unsafe’ experiences while at work, experiences of workplace cultures, and the various ways that the lives of young people are affected by work.

Teenagers Should Work
There are some good effects if teenagers work

Why shouldn't teenagers work instead of getting fat and lazy?

As with the employment of teenagers by industry, there as been an increased concentration of occupations where they work. [Table III] Seventy percent of teenage females work in sales, accommodation services, and as servers, while 52% of males work in these areas. Teenage males’ occupations are more diverse with a substantial proportion of the total working in construction and transportation (17%) and occupations in the primary sectors (9.4%). Over time females had a smaller proportion of their work in social science and government occupation and manufacturing, occupations. The major occupational changes for teenage females over the past 30 years has been the reduction in the proportion of females working in clerical occupations, which accounted for almost 20% of their total work in 1977, but about 8% in 2011. For males, the major changes are the reductions in farming and other primary occupations totalling 15% in 1977, but about 9% in 2007 and manufacturing and construction jobs, totalling about 41% in 1977, but about 23% in 2007.

When Teenagers Work: The Psychological and Social Costs of Adolescent Employment

How to get your teenagers work-ready | Work, Life, Career

Underscoring the significance of gender differences counters some generally held beliefs about the relative similarity of the work of teenage males and females. Because of the fairly low skill levels of much teenage work and the similarity of entry-level wages, it is usually noted that young entrants to the labour force have work experiences that tend to be more homogeneous than that experienced by adult workers. (Crompton and Sanderson 1990 (162); Bauder 2001). This study will show that while this is true, in comparison with older workers, teenage work has considerable variations, particularly by gender, even within specific industrial and occupational categories. So while young males and females may both work at fast food outlets, for example, their specific jobs and experiences are not the same and their experiences of precariousness in their jobs are different. There are also significant variations in the experience of teenage and adult workers with regard to labour protections, which adds to the precariousness of teenage workers’ jobs. The failure to account for teenage workers’ level of experiences and their vulnerability in the design of labour protections make teenagers specifically vulnerable workers and teenage work to be among the most precarious of all kinds of work.

Is it good for teenagers to work? Yes, it's a Good Idea - EssayForum

Limited Number of Positions Online Jobs Teenagers Work Home

The age and vulnerability of teenagers requires that their working conditions are not exploitative or dangerous. Appropriate monitoring of their working conditions to ensure that employers are obeying the law is a minimal requirement to protect these workers. But also necessary are appropriate regulations to prevent unscrupulous behaviour on the part of employers and wages that do not exploit youth. In pointing out the gendered nature of the teenage workforce, the objective is not to show that either males or females necessarily has an employment advantage at this initial stage of workforce participation. Nevertheless, distinct work experiences are evident from initial work experiences and this is contrary to an accepted belief that it is the subsequent responsibilities that women have regarding children and family that creates the major distinctions between adult male and female wages and occupations. The tendency for these gendered divisions to occur can be seen even in entry level work.