I tried to guess what the author means here but I couldn't still get it. https://en.oxforddictionaries.com/definition/cocktail
"The combination in Denmark of stricter liquidity rules and negative rates that most economists predict will last into 2019 are proving a challenging cocktail for the country’s banks. But Danske has shown that lenders can still perform very well in such an environment. It delivered record profits in 2016 and its shares have gained about 16 percent this year, compared with the roughly 10 percent increase in European financial stocks."