Manufacturing jobs are those that create new products directly from either raw materials or components. These jobs are found in a factory, plant, or mill. They can also exist in a home, as long as products, not services, are created.
Reciprocity is based on the principle of returning a favor. As a result, it works brilliantly on a landing page wherein you return a favor for a favor. Obviously, as a marketer, make sure that the giveaway is not refusable and be of utility to your audience.