Canada has a sperm shortage and it is against the law to be compensated

See Canada Imports Precious Bodily Fluids from Alex Tabarrok.

"In 2004 Canada prohibited paying Canadian sperm donors, leading to a tremendous shortage as I had predicted in 2003 (see also my post, The Great Canadian Sperm Shortage). Canadian Peter Jaworski has an update (oddly enough published in USA Today):

Canada used to have a sufficient supply of domestic sperm donors. But in 2004, we passed the Assisted Human Reproduction Act, which made it illegal to compensate donors for their sperm. Shortly thereafter, the number of willing donors plummeted, and sperm donor clinics were shuttered. Now, there is basically just one sperm donor clinic in Canada, and 30-70 Canadian men who donate sperm. Since demand far outstrips supply, we turn to you. We import sperm from for-profit companies in the U.S., where compensating sperm donors is both legal and normal.

Note, by the way, that contrary to what you might expect from Titmuss et al. US sperm is considered to be of high quality because it comes with information about the donor.
And sperm isn’t the only precious bodily fluid that Canada imports.

Canada has never had enough domestic blood plasma for plasma-protein products, such as immune globulin. Our demand for those products, however, is increasing. Last year, we collected only enough blood plasma from unremunerated donors to manufacture 17% of the immune globulin demanded. The rest we imported from you, in exchange for $623 million, or $512 million U.S.

Reliance on your blood plasma looked like it might change a little bit when, in 2012, a company called Canadian Plasma Resources announced plans to open clinics in Ontario dedicated to collecting blood plasma. The trouble is that its business model included compensating donors. Almost immediately, groups such as the Canadian Union of Public Employees and the Canadian Health Coalition began to lobby the Ontario government to pass a law to stop CPR from opening clinics. Ontario obliged in 2014, passing the Safeguarding Health Care Integrity Act, which among other things made compensation illegal.

…As for safety, the fact that we import products made with remunerated donors should tell you that it is emphatically not an issue. Health Canada has said that there is no health concern. The CEO of Canadian Blood Services, Graham Sher, took to YouTube to explain that “it is categorically untrue to say, in 2015 or 2016, that plasma-protein products from paid donors are less safe or unsafe. They are not. They are as safe as the products that are manufactured from our non-remunerated or unpaid donors.”

As Jaworski writes:

What Canada should do is legalize compensation for renewable bodily fluids in our own country. It would be the morally right thing to do. It would help make and save more lives, without harming anybody."