External diseconomy refers to the phenomenon that the daily production or life of an enterprise or individual is adversely affected due to the activities of other enterprises or individuals, but the corresponding compensation cannot be obtained from the enterprises and individuals that cause these effects. Based on this judgment, which of the following options are externally uneconomical? ['A new invention of Zhang is used by others, and the user has not paid him a usage fee.', 'Residents in the upper reaches of the Yellow River planted a lot of grass and trees, and they improved the water quality of the downstream residents while harvesting the timber themselves, but they did not charge any fees to the downstream residents.', 'The paper mill in the upper reaches of the Huaihe River directly discharged sewage to the Huaihe River, which caused a large reduction in crops on both sides of the river. The paper mill did not compensate the affected farmers.', "After an enterprise's production scale expands, with a substantial increase in the number of products, the production cost has not only decreased but has increased, but this rising cost cannot be compensated."]