Positive externalities of innovation

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Key points

  • If inventors received a greater share of the broader social benefits for their work, they would have a greater incentive to seek out new inventions.
  • Positive externalities are beneficial spillovers to a third party or parties.
  • Private benefits are the dollar value of all benefits of a new product or process invented by a company that can be captured by the investing company.
  • Social benefits are the dollar value of all benefits of a new product or process invented by a company that can be captured by other firms and by society as a whole.

The positive externalities of new technology

Why might private firms in a market economy under invest in research and technology?
Think about it this way. If a firm builds a factory or buys a piece of equipment, the firm receives all the economic benefits that result from the investments. However, when a firm invests in new technology, the private benefits, or profits, that the firm receives are only a portion of the overall social benefits.
The social benefits of an innovation take into account the value of all the positive externalities—beneficial spillovers to a third party, or parties—of the new idea or product as well as the private benefits received by the firm that developed the new technology.
Imagine a hypothetical company, Big Drug Company, which is planning its research and development, or R&D, budget for the next year. Economists and scientists working for Big Drug have compiled a list of financial capital necessary for potential R&D projects and estimated interests rates for borrowing this money. You can see these calculations in the graph below. The downward-sloping start text, D, P, r, i, v, a, t, e, end text curve represents the company’s demand for financial capital to support R&D projects at various interest rates.
Now suppose Big Drug's investment in R&D creates a spillover benefit to other firms and households—new innovations often spark other creative endeavors that society also values. If we add the spillover benefits society enjoys to the firm’s private demand for financial capital, we can draw start text, D, S, o, c, i, a, l, end text, which is above start text, D, P, r, i, v, a, t, e, end text on the graph.
If there were a way for the firm to fully monopolize social benefits by somehow making them unavailable to the rest of us, the firm’s private demand curve would be the same as society’s demand curve. According to the graph and table below, if the going rate of interest on borrowing is 8% and the company can receive only the private benefits of innovation, then the company would finance $30 million. Society, at the same rate of 8%, would find it optimal to have $52 million of borrowing. Unless there is a way for the company to fully enjoy the total benefits, then it will borrow less than the socially optimal level of $52 million.
 
 
Return and demand for capital
Interest rate DPrivate, in millions DSocial, in millions
2% $72 $84
4% $52 $72
6% $38 $62
8% $30 $52
10% $26 $44
Big Drug’s original demand for financial capital, start text, D, P, r, i, v, a, t, e, end text, is based on the profits—private benefits—received by the firm. However, other pharmaceutical firms and health care companies may learn new lessons about how to treat certain medical conditions and are then able to create their own competing products—a positive externality that contributes to the social benefit of the drug.
If Big Drug were able to gain 100% of social returns instead of other companies, its demand for financial capital would shift to the demand curve start text, D, S, o, c, i, a, l, end text, and it would be willing to borrow and invest $52 million. If Big Drug received 50% of the social returns, the firm would not spend as much on creating new products. The amount it would be willing to spend would fall somewhere in between start text, D, P, r, i, v, a, t, e, end text and start text, D, S, o, c, i, a, l, end text.
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