It also makes hard currency somewhat problematic, according to some of the more hardcore vegans around the world.
Swatch, the big watchmaker, recently warned about the "extremely problematic" run-up in the currency, even though it reported record half-year profit and sales.
And some analysts on the other side of the political spectrum agree Venezuela's currency controls are problematic.
After initially problematic attempts to reform its currency, an overall loosening of government regulation has contributed to economic growth and stabilized the North's currency and grain market.
Trump's statement on Sunday linking continued US adherence to the One China policy to other problematic issues, such as trade and currency, will be deeply alarming for Beijing.
The Federal Reserve chairman, Alan Greenspan, in a speech this month, called the scale of Japan's dollar purchases "awesome" and warned that such huge intervention in currency markets could become "problematic" for Japan.
Political, policy and currency stability is regarded as the most problematic factor in doing business in Iran.
With a financial transaction, or "Tobin" tax – a small levy on large volume, speculative, international currency trading – the world could pay for one problematic cross-border movement by taxing another.
Costs to maintain a steady flow of currency, pay salaries and raise capital have proven problematic.
Furthermore, access for private-sector traders to hard currency on a sufficiently reliable basis may be problematic.
