The table shows a hypothetical demand schedule for $00$ monosodium glutamate $($MSG$).$ Ajinomoto holds $50\%$ of the market, Jiali holds $30\%$ of the market, and Quingdao holds $20\%$ of the market.

Suppose the three firms agree to form a cartel to fix production of monosodium glutamate. Assume marginal cost equals zero, and the output is split equally across the firms. What quantity maximizes the cartel's profit?

million pounds

$\backslash$table$[[\backslash$table$[[$Price of$],[$MSG $($$$],[$per$],[$pound$)]],\backslash$table$[[$Quantity of$],[$MSG demanded$],[($millions of$],[$pounds$)]]],[$$$8,0],[$$$7,20],[$$$6,30],[$$$5,40],[$$$4,60],[$$$3,90],[$$$2,110],[$$$1,180],[$$$0,300]]$

Suppose Ajinomoto's marginal cost remains equal to zero, but for Jiali and Quingdao, marginal costs rise above zero. How would this affect the incentive of Ajinimoto to act noncooperatively and change its output?